A streamlined life cycle assessment of a coal-fired power plant- the South African case study
- Dunmade, Israel, Madushele, Nkosinathi, Adedeji, Paul A., Akinlabi, Esther Titilayo
- Authors: Dunmade, Israel , Madushele, Nkosinathi , Adedeji, Paul A. , Akinlabi, Esther Titilayo
- Date: 2019
- Subjects: Coal cycle, Coal-fired power plant, Environmental sustainability
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/396624 , uj:32939 , Citation : Dunmade, I. et al. 2019. A streamlined life cycle assessment of a coal-fired power plant- the South African case study
- Description: Abstract : Non-renewable energy sources have detrimental environmental effects, which directly and indirectly affect the biosphere as environmental deposits from their use for energy generation exceed a threshold. This study performs a streamlined lifecycle assessment (LCA) of a coal-fired plant in South Africa. The cradle-to-grave LCA focuses on the coal cycle to determine hotspots with high environmental impacts in the process. Four impact categories were considered in this study; global warming potential, photochemical ozone creation potential, eutrophication potential, and acidification potential. Coal transportation, coal pulverization, water use, and ash management were identified as hotspots in the coal cycle. The coal process has 95% potential for global warming, 4% potential for eutrophication, 1% potential for acidification and a negligible percentage for photochemical ozone creation. Susceptibility to climate change, eutrophication, acid rain, soil degradation and water contamination among others are major concerns of the coal cycle. Outsourcing coal from nearby mines with train as medium of transportation reduces environmental impact. Similarly, the use mitigation technologies like flue gas desulphurization, carbon capture storage or selective catalytic reduction will reduce concentration of flue gas emitted. Ultimately, substituting the coal process with renewable energy sources will ensure environmental sustainability in South Africa. This study will serve as a good resource for further studies on LCA of coal power plants not only in other African countries but in other developing countries with similar situation.
- Full Text:
- Authors: Dunmade, Israel , Madushele, Nkosinathi , Adedeji, Paul A. , Akinlabi, Esther Titilayo
- Date: 2019
- Subjects: Coal cycle, Coal-fired power plant, Environmental sustainability
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/396624 , uj:32939 , Citation : Dunmade, I. et al. 2019. A streamlined life cycle assessment of a coal-fired power plant- the South African case study
- Description: Abstract : Non-renewable energy sources have detrimental environmental effects, which directly and indirectly affect the biosphere as environmental deposits from their use for energy generation exceed a threshold. This study performs a streamlined lifecycle assessment (LCA) of a coal-fired plant in South Africa. The cradle-to-grave LCA focuses on the coal cycle to determine hotspots with high environmental impacts in the process. Four impact categories were considered in this study; global warming potential, photochemical ozone creation potential, eutrophication potential, and acidification potential. Coal transportation, coal pulverization, water use, and ash management were identified as hotspots in the coal cycle. The coal process has 95% potential for global warming, 4% potential for eutrophication, 1% potential for acidification and a negligible percentage for photochemical ozone creation. Susceptibility to climate change, eutrophication, acid rain, soil degradation and water contamination among others are major concerns of the coal cycle. Outsourcing coal from nearby mines with train as medium of transportation reduces environmental impact. Similarly, the use mitigation technologies like flue gas desulphurization, carbon capture storage or selective catalytic reduction will reduce concentration of flue gas emitted. Ultimately, substituting the coal process with renewable energy sources will ensure environmental sustainability in South Africa. This study will serve as a good resource for further studies on LCA of coal power plants not only in other African countries but in other developing countries with similar situation.
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Phase-structural and morphological features, dehydrogenation/re-hydrogenation performance and hydrolysis of nanocomposites prepared by ball milling of MgH2 with germanium
- Adeniran, J. A., Akbarzadeh, R., Lototskyy, M., Nyallang Nyamsi, S., Olorundare, O. F., Akinlabi, Esther Titilayo, Jen, T. C.
- Authors: Adeniran, J. A. , Akbarzadeh, R. , Lototskyy, M. , Nyallang Nyamsi, S. , Olorundare, O. F. , Akinlabi, Esther Titilayo , Jen, T. C.
- Date: 2019
- Subjects: Magnesium hydride , Germanium , Ball milling
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/396766 , uj:32950 , Citation: Adeniran, J. A. 2019. Phase-structural and morphological features, dehydrogenation/re-hydrogenation performance and hydrolysis of nanocomposites prepared by ball milling of MgH2 with germanium.
- Description: Abstract: Ball milling of magnesium hydride with germanium additives in argon for up to 10 hours was shown to result in the formation of nanocomposites of - and -modifications of MgH2 together with individual Ge phase. During the heating, Ge interacts with MgH2 to form Mg2Ge at T>370 °C; the phase transformation overlaps with MgH2 decomposition and Mg2Ge phase remains in the material after its re-hydrogenation at T=350 °C and P(H2)~15 bar. The ball milled Ge-MgH2 nanocomposites were found to be characterised by an improved hydrogen release via hydrolysis in organic acid solutions as compared to pure MgH2 prepared and tested at the same conditions. It was found that the composite containing 5 wt% of Ge and ball milled for 5 hours showed the best hydrogen generation performance, with total hydrogen release exceeding 1.55 NL/g (yield close to 100%) in one minute.
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- Authors: Adeniran, J. A. , Akbarzadeh, R. , Lototskyy, M. , Nyallang Nyamsi, S. , Olorundare, O. F. , Akinlabi, Esther Titilayo , Jen, T. C.
- Date: 2019
- Subjects: Magnesium hydride , Germanium , Ball milling
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/396766 , uj:32950 , Citation: Adeniran, J. A. 2019. Phase-structural and morphological features, dehydrogenation/re-hydrogenation performance and hydrolysis of nanocomposites prepared by ball milling of MgH2 with germanium.
- Description: Abstract: Ball milling of magnesium hydride with germanium additives in argon for up to 10 hours was shown to result in the formation of nanocomposites of - and -modifications of MgH2 together with individual Ge phase. During the heating, Ge interacts with MgH2 to form Mg2Ge at T>370 °C; the phase transformation overlaps with MgH2 decomposition and Mg2Ge phase remains in the material after its re-hydrogenation at T=350 °C and P(H2)~15 bar. The ball milled Ge-MgH2 nanocomposites were found to be characterised by an improved hydrogen release via hydrolysis in organic acid solutions as compared to pure MgH2 prepared and tested at the same conditions. It was found that the composite containing 5 wt% of Ge and ball milled for 5 hours showed the best hydrogen generation performance, with total hydrogen release exceeding 1.55 NL/g (yield close to 100%) in one minute.
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Advanced manufacture of compositionally composite graded materials : an overview
- Mahamood, R.M., Akinlabi, Esther Titilayo, Abdulrahman, K.O., Owolabi, M.G.
- Authors: Mahamood, R.M. , Akinlabi, Esther Titilayo , Abdulrahman, K.O. , Owolabi, M.G.
- Date: 2018
- Subjects: Additive manufacturing , Functionally graded materials , Selective laser melting
- Language: English
- Type: Book Chapter
- Identifier: http://hdl.handle.net/10210/291077 , uj:31601 , Citation: Mahamood, R.M., Akinlabi, E.T. & Abdulrahman, K.O. 2018. Advanced manufacture of compositionally composite graded materials : an overview.
- Description: Abstract: Compositionally graded composite materials are advanced materials that consists of inhomogeneous composition as well as structure that varies across the entire volume and with changing properties. Functionally graded materials are produced through different manufacturing processes which include centrifugal method, powder metallurgy method, and additive manufacturing technology. Additive Manufacturing (AM) is an advanced manufacturing process used to produce three dimensional objects simply by adding materials in layers using the digital image of the component. In this chapter, the production of compositionally graded composite materials using an advanced manufacturing method, laser additive manufacturing technologies, which include selective laser melting/sintering and laser metal deposition/laser material deposition (LMD) processes are reviewed and the recent research progress are also presented.
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- Authors: Mahamood, R.M. , Akinlabi, Esther Titilayo , Abdulrahman, K.O. , Owolabi, M.G.
- Date: 2018
- Subjects: Additive manufacturing , Functionally graded materials , Selective laser melting
- Language: English
- Type: Book Chapter
- Identifier: http://hdl.handle.net/10210/291077 , uj:31601 , Citation: Mahamood, R.M., Akinlabi, E.T. & Abdulrahman, K.O. 2018. Advanced manufacture of compositionally composite graded materials : an overview.
- Description: Abstract: Compositionally graded composite materials are advanced materials that consists of inhomogeneous composition as well as structure that varies across the entire volume and with changing properties. Functionally graded materials are produced through different manufacturing processes which include centrifugal method, powder metallurgy method, and additive manufacturing technology. Additive Manufacturing (AM) is an advanced manufacturing process used to produce three dimensional objects simply by adding materials in layers using the digital image of the component. In this chapter, the production of compositionally graded composite materials using an advanced manufacturing method, laser additive manufacturing technologies, which include selective laser melting/sintering and laser metal deposition/laser material deposition (LMD) processes are reviewed and the recent research progress are also presented.
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Analysis of the influence of the laser power on the microstructure and properties of titanium alloy - reinforced boron carbide matrix composite (Ti6Al4V-B4C)
- Ogunlana, Musibau O., Akinlabi, Esther Titilayo, Erinosho, Mutiu F.
- Authors: Ogunlana, Musibau O. , Akinlabi, Esther Titilayo , Erinosho, Mutiu F.
- Date: 2018
- Subjects: Dry sliding wear , LMD , Microhardness
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/289888 , uj:31461 , Citation: Ogunlana, M.O., Akinlabi, E.T. & Erinosho, M. 2018. Analysis of the influence of the laser power on the microstructure and properties of titanium alloy - reinforced boron carbide matrix composite (Ti6Al4V-B4C).
- Description: Abstract: Laser Metal Deposition (LMD) process is a means of producing metal composites with the aid of laser beam being ejected onto the substrate with the participating powder and fused together after solidification. In this research work, Ti6Al4V alloy is fused with 20 wt % of B4C in order to form metal matrix composites (MMCs). Using the Ytterbium Fibre Laser System powdered at 3000 W, the laser powers were varied between 800 W and 2400 W while all other supporting process parameters were kept constant. The deposited Ti6Al4V-B4C composites were characterized through the surfacing microstructure, microhardness and dry sliding wear. The microstructural properties of the deposited samples were profound with Widmanstätten structure of α-Ti, β-Ti and (α+β) Ti phases. The microhardness tests revealed that the composites deposited with a laser power of 2000 W exhibited the highest hardness value and standard deviation of HV 445 ± 61. Furthermore characterisation revealed that, the sample produced with the laser power of 800 W had the lowest wear loss and wear rate of 35.2 x 10-3 mm3 and 6.42 x 10-4 mm3/Nm. However, the motivation for this work is to improve the material properties of Ti6Al4V alloy for surface engineering applications.
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- Authors: Ogunlana, Musibau O. , Akinlabi, Esther Titilayo , Erinosho, Mutiu F.
- Date: 2018
- Subjects: Dry sliding wear , LMD , Microhardness
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/289888 , uj:31461 , Citation: Ogunlana, M.O., Akinlabi, E.T. & Erinosho, M. 2018. Analysis of the influence of the laser power on the microstructure and properties of titanium alloy - reinforced boron carbide matrix composite (Ti6Al4V-B4C).
- Description: Abstract: Laser Metal Deposition (LMD) process is a means of producing metal composites with the aid of laser beam being ejected onto the substrate with the participating powder and fused together after solidification. In this research work, Ti6Al4V alloy is fused with 20 wt % of B4C in order to form metal matrix composites (MMCs). Using the Ytterbium Fibre Laser System powdered at 3000 W, the laser powers were varied between 800 W and 2400 W while all other supporting process parameters were kept constant. The deposited Ti6Al4V-B4C composites were characterized through the surfacing microstructure, microhardness and dry sliding wear. The microstructural properties of the deposited samples were profound with Widmanstätten structure of α-Ti, β-Ti and (α+β) Ti phases. The microhardness tests revealed that the composites deposited with a laser power of 2000 W exhibited the highest hardness value and standard deviation of HV 445 ± 61. Furthermore characterisation revealed that, the sample produced with the laser power of 800 W had the lowest wear loss and wear rate of 35.2 x 10-3 mm3 and 6.42 x 10-4 mm3/Nm. However, the motivation for this work is to improve the material properties of Ti6Al4V alloy for surface engineering applications.
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Atomic force microscopy analysis of surface topography of pure thin aluminium films
- Mwema, F.M., Oladijo, O.P., Sathiaraj, T.S., Akinlabi, Esther Titilayo
- Authors: Mwema, F.M. , Oladijo, O.P. , Sathiaraj, T.S. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Atomic Force Microscopy , Magnetron sputtering , Power Spectral Density
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290690 , uj:31561 , Citation: Mwema, F.M. et al. 2018. Atomic force microscopy analysis of surface topography of pure thin aluminium films.
- Description: Abstract: Pure aluminium thin films were deposited on stainless and mild steel substrates through rf magnetron sputtering at rf powers of 150 and 200 W. Surface analysis of the films was undertaken using atomic force microscopy. The surface structure evolution, roughness and distribution were examined and discussed. Power spectral density, skewness and Kurtosis parameters were used to explain the nature and distribution of the surface structures on the thin aluminium films as reported from the line profile analyses. The result shows that the morphologies of the surface structures of Al films vary with power and substrate type. The coatings exhibit the higher roughness at 200 W. There is strong links that exist between AFM observations and SEM. This implies that AFM can be considerably used to study the microstructural evolution of Al thin films during magnetron sputtering.
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- Authors: Mwema, F.M. , Oladijo, O.P. , Sathiaraj, T.S. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Atomic Force Microscopy , Magnetron sputtering , Power Spectral Density
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290690 , uj:31561 , Citation: Mwema, F.M. et al. 2018. Atomic force microscopy analysis of surface topography of pure thin aluminium films.
- Description: Abstract: Pure aluminium thin films were deposited on stainless and mild steel substrates through rf magnetron sputtering at rf powers of 150 and 200 W. Surface analysis of the films was undertaken using atomic force microscopy. The surface structure evolution, roughness and distribution were examined and discussed. Power spectral density, skewness and Kurtosis parameters were used to explain the nature and distribution of the surface structures on the thin aluminium films as reported from the line profile analyses. The result shows that the morphologies of the surface structures of Al films vary with power and substrate type. The coatings exhibit the higher roughness at 200 W. There is strong links that exist between AFM observations and SEM. This implies that AFM can be considerably used to study the microstructural evolution of Al thin films during magnetron sputtering.
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Composition, characteristics and socioeconomic benefits of palm kernel shell exploitation - an overview
- Ikumapayi, Omolayo M., Akinlabi, Esther Titilayo
- Authors: Ikumapayi, Omolayo M. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Biomass , Palm kernel shell , Reinforcement
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290412 , uj:31527 , Citation: Omolayo M. Ikumapayi and Esther T. Akinlabi, 2018. Composition, characteristics and socioeconomic benefits of palm kernel shell exploitation-an overview. J. Environ. Sci. Technol., 11: 220-232.
- Description: Abstract: Intensive research has increased the creation of new biomaterials with specific engineered properties. It is on record that a large amount of these biomaterials waste are generated by the processing of palm oil that invariably causes an environmental problem. This review study sheds light on various applications that palm kernel shell (PKS) has been used for in the recent years and applications that could also be considered in the near future. It has been reported that tropical belt of Africa, Asia and Brazil are the highest producers and exporters of palm oil across the globe and by implication the most producers of the PKS. The PKS as a biomaterial waste product got after the processing of palm oil has been extensively utilized in the various form of applications for both technical and environmental benefits varying from additive, energy production, reinforcement, aggregation, water purification and as well as a composite matrix. It was observed that great use of this waste product is prominent in the structural components, automotive parts as well as water detoxifier. The PKS-powder has been characterized in this review through the use of Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) analysis. The milling was done with the aid of digital Vibratory disc milling machine for 0, 10, 15 and 20 min. Zero min was taken to be when it was sieved with a 300 μm ASTM standard sieve. It was established in the study that the duration of the milling affects volume, surface area, particle size, pore size distributions, micro structure and some other mechanical properties as well as the morphology of the powder. The particles size got reduced from 300 μm to average diameter of 200 nm. The variations in elemental compositions of palm kernel shell powder from as they were affected by milling. The micrographs revealed that there was a tremendous reduction in grain size from 300 μm to about 200 nm.
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- Authors: Ikumapayi, Omolayo M. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Biomass , Palm kernel shell , Reinforcement
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290412 , uj:31527 , Citation: Omolayo M. Ikumapayi and Esther T. Akinlabi, 2018. Composition, characteristics and socioeconomic benefits of palm kernel shell exploitation-an overview. J. Environ. Sci. Technol., 11: 220-232.
- Description: Abstract: Intensive research has increased the creation of new biomaterials with specific engineered properties. It is on record that a large amount of these biomaterials waste are generated by the processing of palm oil that invariably causes an environmental problem. This review study sheds light on various applications that palm kernel shell (PKS) has been used for in the recent years and applications that could also be considered in the near future. It has been reported that tropical belt of Africa, Asia and Brazil are the highest producers and exporters of palm oil across the globe and by implication the most producers of the PKS. The PKS as a biomaterial waste product got after the processing of palm oil has been extensively utilized in the various form of applications for both technical and environmental benefits varying from additive, energy production, reinforcement, aggregation, water purification and as well as a composite matrix. It was observed that great use of this waste product is prominent in the structural components, automotive parts as well as water detoxifier. The PKS-powder has been characterized in this review through the use of Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray (EDX) analysis. The milling was done with the aid of digital Vibratory disc milling machine for 0, 10, 15 and 20 min. Zero min was taken to be when it was sieved with a 300 μm ASTM standard sieve. It was established in the study that the duration of the milling affects volume, surface area, particle size, pore size distributions, micro structure and some other mechanical properties as well as the morphology of the powder. The particles size got reduced from 300 μm to average diameter of 200 nm. The variations in elemental compositions of palm kernel shell powder from as they were affected by milling. The micrographs revealed that there was a tremendous reduction in grain size from 300 μm to about 200 nm.
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Constrained bending and straightening - a proposed method for severe plastic deformation of metals
- Mwita, W.M., Akinlabi, Esther Titilayo, Sanusi, K.O.
- Authors: Mwita, W.M. , Akinlabi, Esther Titilayo , Sanusi, K.O.
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/291184 , uj:31616 , Citation: Mwita, W.M., Akinlabi, E.T. & Sanusi, K.O. 2018. Constrained bending and straightening - a proposed method for severe plastic deformation of metals.
- Description: Abstract: The use of severe plastic deformation (SPD) technology to process ultra-fine/nano grains metals with enhanced desired properties for structural and biomedical applications have shown good results. However, SPD technology is still limited to discrete processes, small size samples with inhomogeneous strain. This paper proposes a new method for severe plastic deformation of metals known as constrained bending and straightening (CBS). The method is aimed to provide continuous production of ultra-fine/nano grains metals with improved strain homogeneity. The CBS process analytical model and its working principle are presented, a constitutive relation of feed length, bend roller diameter, effective strain and tensile strength is established. Results show that the magnitude and homogeneity of induced effective strain and tensile strength increase with the decrease of both feed length and bending roller diameter. Effective strain increased by 200% from 6mm to 2mm feed lengths. At 2mm feed length, tensile stress increased from 1223.8 MPa at 1 pass to 1302.5 MPa at 4 pass. Results from this study promise that CBS technique is potential to be adapted for continuous SPD of bulky length metal sheets with enhanced homogeneous properties.
- Full Text:
- Authors: Mwita, W.M. , Akinlabi, Esther Titilayo , Sanusi, K.O.
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/291184 , uj:31616 , Citation: Mwita, W.M., Akinlabi, E.T. & Sanusi, K.O. 2018. Constrained bending and straightening - a proposed method for severe plastic deformation of metals.
- Description: Abstract: The use of severe plastic deformation (SPD) technology to process ultra-fine/nano grains metals with enhanced desired properties for structural and biomedical applications have shown good results. However, SPD technology is still limited to discrete processes, small size samples with inhomogeneous strain. This paper proposes a new method for severe plastic deformation of metals known as constrained bending and straightening (CBS). The method is aimed to provide continuous production of ultra-fine/nano grains metals with improved strain homogeneity. The CBS process analytical model and its working principle are presented, a constitutive relation of feed length, bend roller diameter, effective strain and tensile strength is established. Results show that the magnitude and homogeneity of induced effective strain and tensile strength increase with the decrease of both feed length and bending roller diameter. Effective strain increased by 200% from 6mm to 2mm feed lengths. At 2mm feed length, tensile stress increased from 1223.8 MPa at 1 pass to 1302.5 MPa at 4 pass. Results from this study promise that CBS technique is potential to be adapted for continuous SPD of bulky length metal sheets with enhanced homogeneous properties.
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Corrosion behaviour of laser additive manufactured titanium alloy
- Mahamood, R.M., Akinlabi, Esther Titilayo
- Authors: Mahamood, R.M. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Corosion rate , Laser metal deposition , Laser Engineered Net shaping
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290913 , uj:31589 , Citation: Mahamood, R.M. & Akinlabi, E.T. 2018. Corrosion behaviour of laser additive manufactured titanium alloy.
- Description: Abstract: The influence of process parameter on corrosion behavior of the most widely used titanium alloy-Ti6Al4V, produced using laser metal deposition process was studied. The processing parameters: scanning velocity, the powder flow rate and gas flow rate were kept at constant values of 0,005m/s, 1.44 g/min and 4 l/min while the laser power was varied between 0.8 to 3.0 kW. Electrochemical corrosion test was conducted on each of the samples produced at each set of processing parameters. The corrosive media used is the solution of sodium chloride (NaCl) desolved in deionized water. The results of this study indicate that the as the laser power was increase, the corrosion behaviour was found to be improved. The better corrosion resistance performance of the additive manufacture part can be attributed to the higher cooling rate that is associated with this type of manufacturing process. This high cooling rate results in the higher hardness of the material which could also contribute to the improved corrosion resistance behaviour.
- Full Text:
- Authors: Mahamood, R.M. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Corosion rate , Laser metal deposition , Laser Engineered Net shaping
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290913 , uj:31589 , Citation: Mahamood, R.M. & Akinlabi, E.T. 2018. Corrosion behaviour of laser additive manufactured titanium alloy.
- Description: Abstract: The influence of process parameter on corrosion behavior of the most widely used titanium alloy-Ti6Al4V, produced using laser metal deposition process was studied. The processing parameters: scanning velocity, the powder flow rate and gas flow rate were kept at constant values of 0,005m/s, 1.44 g/min and 4 l/min while the laser power was varied between 0.8 to 3.0 kW. Electrochemical corrosion test was conducted on each of the samples produced at each set of processing parameters. The corrosive media used is the solution of sodium chloride (NaCl) desolved in deionized water. The results of this study indicate that the as the laser power was increase, the corrosion behaviour was found to be improved. The better corrosion resistance performance of the additive manufacture part can be attributed to the higher cooling rate that is associated with this type of manufacturing process. This high cooling rate results in the higher hardness of the material which could also contribute to the improved corrosion resistance behaviour.
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Data on triethylenetetramine effect on steel‐rebar corrosion‐rate in concrete immersed in 0.5 M H2SO4
- Okeniyi, Joshua Olusegun, Akinlabi, Esther Titilayo, Ikotun, Jacob Olumuyiwa, Akinlabi, Stephen Akinwale, Okeniyi, Elizabeth Toyin
- Authors: Okeniyi, Joshua Olusegun , Akinlabi, Esther Titilayo , Ikotun, Jacob Olumuyiwa , Akinlabi, Stephen Akinwale , Okeniyi, Elizabeth Toyin
- Date: 2018
- Subjects: Corrosion , Reinforcing‐steel , Steel‐reinforced‐concrete
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290929 , uj:31591 , Citation: Okeniyi, J.O. et al. 2018. Data on triethylenetetramine effect on steel‐rebar corrosion‐rate in concrete immersed in 0.5 M H2SO4.
- Description: Abstract: In this article, the dataset on the effect of different triethylenetetramine (TETA: C6H18N4) concentrations on the corrosion‐rate of steel‐rebar embedment in steel‐reinforced concrete immersed in 0.5 M H2SO4 (for simulating industrial/microbial environment) is presented. The corrosion test‐data was obtained from weekly monitoring, over seven weeks of steel‐reinforced concrete immersion, using linear‐polarizationresistance (LPR) measuring instrument. The dataset and its requisite analyses, as per ASTM G16—13, are presented in graphs and tables. The analyses detailed include descriptive statistics of the Normal, Gumbel and Weibull probability distribution functions (pdf’s), and tests‐of‐fit significance by the Kolmogorov‐ Smirnov goodness‐of‐fit statistics. The detailed information from this corrosion tests dataset is useful for further research on the inhibition mechanism and effectiveness of the triethylenetetramine chemical on the corrosion‐protection of reinforcing‐steel material in steel‐reinforced concrete designed for the industrial/microbial service‐environment.
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- Authors: Okeniyi, Joshua Olusegun , Akinlabi, Esther Titilayo , Ikotun, Jacob Olumuyiwa , Akinlabi, Stephen Akinwale , Okeniyi, Elizabeth Toyin
- Date: 2018
- Subjects: Corrosion , Reinforcing‐steel , Steel‐reinforced‐concrete
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290929 , uj:31591 , Citation: Okeniyi, J.O. et al. 2018. Data on triethylenetetramine effect on steel‐rebar corrosion‐rate in concrete immersed in 0.5 M H2SO4.
- Description: Abstract: In this article, the dataset on the effect of different triethylenetetramine (TETA: C6H18N4) concentrations on the corrosion‐rate of steel‐rebar embedment in steel‐reinforced concrete immersed in 0.5 M H2SO4 (for simulating industrial/microbial environment) is presented. The corrosion test‐data was obtained from weekly monitoring, over seven weeks of steel‐reinforced concrete immersion, using linear‐polarizationresistance (LPR) measuring instrument. The dataset and its requisite analyses, as per ASTM G16—13, are presented in graphs and tables. The analyses detailed include descriptive statistics of the Normal, Gumbel and Weibull probability distribution functions (pdf’s), and tests‐of‐fit significance by the Kolmogorov‐ Smirnov goodness‐of‐fit statistics. The detailed information from this corrosion tests dataset is useful for further research on the inhibition mechanism and effectiveness of the triethylenetetramine chemical on the corrosion‐protection of reinforcing‐steel material in steel‐reinforced concrete designed for the industrial/microbial service‐environment.
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Effect of [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane on the corrosion protection enhancement of hydrophobic film coated on AISI 304
- Baruwa, A.D., Akinlabi, Esther Titilayo, Oladijo, O.P., Maledi, N., Chinn, J.
- Authors: Baruwa, A.D. , Akinlabi, Esther Titilayo , Oladijo, O.P. , Maledi, N. , Chinn, J.
- Date: 2018
- Subjects: AISI 304 , Corrosion , Hydrophobic coating
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290905 , uj:31588 , Citation: Baruwa, A.D. et al. 2018. Effect of [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane on the corrosion protection enhancement of hydrophobic film coated on AISI 304.
- Description: Abstract: The effects of Organofunctional moieties and the adhesion properties of hydrophobic [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane (Alkyl)] coated on AISI 304 to determine the corrosion resistance were investigated and presented. Two different types of adhesion, namely: silicon oxide and plasma silicon oxide films were grown on AISI 304 with the aid of an atomic‐layer deposition technique. The effects of the surface preparations on the functionality and the properties of the hydrophobic silane coating were characterized, using the scanning electron microscope (SEM) and the atomic force microscope (AFM) for morphology and topography. X‐ray diffraction (XRD) and attenuated Fourier‐transform infrared (FTIR‐ATR) were used for the chemical composition and the bonding structure, the water contact angle were measured and processed, as well as the determination of electrochemistry of the coated and uncoated surfaces. The results showed that the silicon oxide treated surface improved the durability of the silane film in the corrosive medium; and that has more chemical stability with the coating, when compared with the plasma silicon oxide and base material, which was distinctly discussed.
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- Authors: Baruwa, A.D. , Akinlabi, Esther Titilayo , Oladijo, O.P. , Maledi, N. , Chinn, J.
- Date: 2018
- Subjects: AISI 304 , Corrosion , Hydrophobic coating
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290905 , uj:31588 , Citation: Baruwa, A.D. et al. 2018. Effect of [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane on the corrosion protection enhancement of hydrophobic film coated on AISI 304.
- Description: Abstract: The effects of Organofunctional moieties and the adhesion properties of hydrophobic [Tris(trimethylsiloxy)silyethyl]dimethylchlorosilane (Alkyl)] coated on AISI 304 to determine the corrosion resistance were investigated and presented. Two different types of adhesion, namely: silicon oxide and plasma silicon oxide films were grown on AISI 304 with the aid of an atomic‐layer deposition technique. The effects of the surface preparations on the functionality and the properties of the hydrophobic silane coating were characterized, using the scanning electron microscope (SEM) and the atomic force microscope (AFM) for morphology and topography. X‐ray diffraction (XRD) and attenuated Fourier‐transform infrared (FTIR‐ATR) were used for the chemical composition and the bonding structure, the water contact angle were measured and processed, as well as the determination of electrochemistry of the coated and uncoated surfaces. The results showed that the silicon oxide treated surface improved the durability of the silane film in the corrosive medium; and that has more chemical stability with the coating, when compared with the plasma silicon oxide and base material, which was distinctly discussed.
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Effect of coating thickness on wear performance of Inconel 625 coating
- Phiri, R.R., Oladijo, O.P., Maledi, N., Akinlabi, Esther Titilayo
- Authors: Phiri, R.R. , Oladijo, O.P. , Maledi, N. , Akinlabi, Esther Titilayo
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/291103 , uj:31605 , Citation: Phiri, R.R. et al. 2018. Effect of coating thickness on wear performance of Inconel 625 coating.
- Description: Abstract: INCONEL® nickel-chromium alloy 625 is widely used for its high strength, excellent corrosion resistance and creep resistance on prolonged exposure to aggressive environment. However, despite its properties and industrial application, its wear resistance is not entirely satisfactory. The article investigates and presents the tribological performance of Inconel 625 coating using reciprocating scratch test. High velocity oxyfuel (HVOF) method was used to deposit Inconel 625 film onto 304 stainless steel surfaces. The frictional behavior and wear data were studied in order to observe the effect of coating thickness on wear failure. The results revealed that coatings of higher thickness showed lower coefficient of friction, better adhesion and good wear resistance in comparison to the low coating thickness.
- Full Text:
- Authors: Phiri, R.R. , Oladijo, O.P. , Maledi, N. , Akinlabi, Esther Titilayo
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/291103 , uj:31605 , Citation: Phiri, R.R. et al. 2018. Effect of coating thickness on wear performance of Inconel 625 coating.
- Description: Abstract: INCONEL® nickel-chromium alloy 625 is widely used for its high strength, excellent corrosion resistance and creep resistance on prolonged exposure to aggressive environment. However, despite its properties and industrial application, its wear resistance is not entirely satisfactory. The article investigates and presents the tribological performance of Inconel 625 coating using reciprocating scratch test. High velocity oxyfuel (HVOF) method was used to deposit Inconel 625 film onto 304 stainless steel surfaces. The frictional behavior and wear data were studied in order to observe the effect of coating thickness on wear failure. The results revealed that coatings of higher thickness showed lower coefficient of friction, better adhesion and good wear resistance in comparison to the low coating thickness.
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Effect of FSW on the mechanical properties and microstructure of 6082-T6 AA
- Akinlabi, S.A., Mashinini, M.P., Fatoba, S.O., Akinlabi, Esther Titilayo
- Authors: Akinlabi, S.A. , Mashinini, M.P. , Fatoba, S.O. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Friction Stir Welding , Heat Input , Joint Efficiency
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/290944 , uj:31593 , Citation: Akinlabi, S.A. et al. 2018. Effect of FSW on the mechanical properties and microstructure of 6082-T6 AA.
- Description: Abstract: This paper reports the effect of Friction Stir Welding on the mechanical properties and microstructure of 6082- T6 Aluminium alloy. The welds were produced using three different transverse speeds of 90, 120 and 150m/min to vary the heat input to the wields. The rotational speed of 750rpm is constant for the three welds samples, plunge depth of 0.31mm and tool tilt angle of 3 degrees was employed. The mechanical properties were characterised by the tensile analysis, the microhardness and joint efficiency of the welded interface. The microstructures, macrostructures, fracture surface and grain sizes were characterised. The result revealed that tensile strength at the joint interfaces of the three samples was enhanced as the transverse speed increases from 90m/min to 150m/min. The joint efficiency of the joint interfaces of the three welded samples increases. The Vickers hardness values at the joint interfaces were enhanced for the three samples when compared with the base material. This is attributed to the strain hardening phenomenon. The resulting microstructural characterization shows that good metallurgical bonding was achieved at the joint interfaces of the welds produced, this is evident with the presence of the transition region separating the advancing side from the retreating side of the joint interfaces.
- Full Text:
- Authors: Akinlabi, S.A. , Mashinini, M.P. , Fatoba, S.O. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Friction Stir Welding , Heat Input , Joint Efficiency
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/290944 , uj:31593 , Citation: Akinlabi, S.A. et al. 2018. Effect of FSW on the mechanical properties and microstructure of 6082-T6 AA.
- Description: Abstract: This paper reports the effect of Friction Stir Welding on the mechanical properties and microstructure of 6082- T6 Aluminium alloy. The welds were produced using three different transverse speeds of 90, 120 and 150m/min to vary the heat input to the wields. The rotational speed of 750rpm is constant for the three welds samples, plunge depth of 0.31mm and tool tilt angle of 3 degrees was employed. The mechanical properties were characterised by the tensile analysis, the microhardness and joint efficiency of the welded interface. The microstructures, macrostructures, fracture surface and grain sizes were characterised. The result revealed that tensile strength at the joint interfaces of the three samples was enhanced as the transverse speed increases from 90m/min to 150m/min. The joint efficiency of the joint interfaces of the three welded samples increases. The Vickers hardness values at the joint interfaces were enhanced for the three samples when compared with the base material. This is attributed to the strain hardening phenomenon. The resulting microstructural characterization shows that good metallurgical bonding was achieved at the joint interfaces of the welds produced, this is evident with the presence of the transition region separating the advancing side from the retreating side of the joint interfaces.
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Effect of heat treatment on microstructure and mechanical properties of magnesium alloy
- Sanusi, Kazeem O., Madushele, Nkosinathi, Akinlabi, Esther Titilayo
- Authors: Sanusi, Kazeem O. , Madushele, Nkosinathi , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Magnesium , Heat treatment , Microstructure
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/260614 , uj:27447 , Citation: Sanusi, K.O., Madushele, N. & Akinlabi, E.T. 2018. Effect of heat treatment on microstructure and mechanical properties of magnesium alloy.
- Description: Abstract: In this research study, the effect of heat treatment on mechanical properties, and microstructure characteristics of magnesium alloy with 99.94 % magnesium was studied. The heat treatment of samples was conducted at 150 ⁰C, 300 ⁰C, and 450 ⁰C for 2 hours. The samples were characterized by microstructure characterization using optical microscope (OEM) by observing the evolution of the microstructure of the heat-treated magnesium alloy. The hardness test was done on the surface of each sample using the load of 50 N to show the effect of heat treatment on the cross-section surface of magnesium alloy. From the results, the average grain sizes of the materials are different due to the different heat treatment and cooling rate of the materials.it is found that the hardness of the surface of the samples is higher at the edges of the samples than in the middle. The changes in average hardness of magnesium with the increase in temperature is due to an increase in grain size.
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- Authors: Sanusi, Kazeem O. , Madushele, Nkosinathi , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Magnesium , Heat treatment , Microstructure
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/260614 , uj:27447 , Citation: Sanusi, K.O., Madushele, N. & Akinlabi, E.T. 2018. Effect of heat treatment on microstructure and mechanical properties of magnesium alloy.
- Description: Abstract: In this research study, the effect of heat treatment on mechanical properties, and microstructure characteristics of magnesium alloy with 99.94 % magnesium was studied. The heat treatment of samples was conducted at 150 ⁰C, 300 ⁰C, and 450 ⁰C for 2 hours. The samples were characterized by microstructure characterization using optical microscope (OEM) by observing the evolution of the microstructure of the heat-treated magnesium alloy. The hardness test was done on the surface of each sample using the load of 50 N to show the effect of heat treatment on the cross-section surface of magnesium alloy. From the results, the average grain sizes of the materials are different due to the different heat treatment and cooling rate of the materials.it is found that the hardness of the surface of the samples is higher at the edges of the samples than in the middle. The changes in average hardness of magnesium with the increase in temperature is due to an increase in grain size.
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Effect of milling parameters on microhardness and microstructure during dry and flood milling of Ti-6Al-4V
- Mathoho, Ipfi, Akinlabi, Esther Titilayo, Mubiayi, Mukuna Patrick, Mbohwa, Charles
- Authors: Mathoho, Ipfi , Akinlabi, Esther Titilayo , Mubiayi, Mukuna Patrick , Mbohwa, Charles
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/291192 , uj:31617 , Citation: Mathoho, I. et al. 2018. Effect of milling parameters on microhardness and microstructure during dry and flood milling of Ti-6Al-4V.
- Description: Abstract: The current study focuses on investigating the effect of milling parameters on the microhardness during dry and flood milling of Ti-6Al-4V. Dry and flood milling were performed while varying spindle speed (120, 150, and 180 rev/min), depth of cut (1, 1.5 and 2 mm), as the feed rate (4.6 mm/min) was kept constant. Subsequent to milling, milled surfaces microhardness were measured and microstructure evolution was analysed using an optical microscope. It was established that the deformation of beta phase increased with increase of spindle speed during dry milling while during flood milling there was no microstructural change associated to the increase of the spindle speed. On the other hand, the hardness increased as result of increase of spindle speed during both dry and flood milling. Flood milling generated a maximum hardness of 338.44 HV at 180 rev/min which is superior to maximum hardness of 336.36 HV produced during dry milling. Dry milling at 1.5 mm depth of cut generated maximum deformation of beta phase while during flood milling maximum deformation was recorded at 2 mm depth of cut. The hardness increased with increment of depth of cut during flood milling while it decreased with increase of depth of cut during dry milling.
- Full Text:
- Authors: Mathoho, Ipfi , Akinlabi, Esther Titilayo , Mubiayi, Mukuna Patrick , Mbohwa, Charles
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/291192 , uj:31617 , Citation: Mathoho, I. et al. 2018. Effect of milling parameters on microhardness and microstructure during dry and flood milling of Ti-6Al-4V.
- Description: Abstract: The current study focuses on investigating the effect of milling parameters on the microhardness during dry and flood milling of Ti-6Al-4V. Dry and flood milling were performed while varying spindle speed (120, 150, and 180 rev/min), depth of cut (1, 1.5 and 2 mm), as the feed rate (4.6 mm/min) was kept constant. Subsequent to milling, milled surfaces microhardness were measured and microstructure evolution was analysed using an optical microscope. It was established that the deformation of beta phase increased with increase of spindle speed during dry milling while during flood milling there was no microstructural change associated to the increase of the spindle speed. On the other hand, the hardness increased as result of increase of spindle speed during both dry and flood milling. Flood milling generated a maximum hardness of 338.44 HV at 180 rev/min which is superior to maximum hardness of 336.36 HV produced during dry milling. Dry milling at 1.5 mm depth of cut generated maximum deformation of beta phase while during flood milling maximum deformation was recorded at 2 mm depth of cut. The hardness increased with increment of depth of cut during flood milling while it decreased with increase of depth of cut during dry milling.
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Influence of laser power on improving the wear properties of laser deposited Ti-6Al-4V+B4C composite
- Erinosho, Mutiu F., Akinlabi, Esther Titilayo
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Laser metal deposition , Microstructure , Wear measurement
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/273312 , uj:29114 , Citation: Erinosho, M.F. & Akinlabi, E.T. 2018. Influence of laser power on improving the wear properties of laser deposited Ti-6Al-4V+B4C composite.
- Description: Abstract: Titanium and its alloys have possessed outstanding properties such as high specific strength, good oxidation and corrosion resistance; which have made them extensively suitable for use in the aeronautical, medical, automobile, marine and chemical industries. This paper presents the impact of laser power on the microstructure and the wear properties of titanium matrix Ti-6Al-4V+B4C composites. The laser powers were varied between 0.8 kW and 2.2 kW while keeping other contributing parameters constant. The microstructural effects were characterised with increasing α-Ti lamella and coarse Widmanstettan structures as the laser power was increased; alongside with the inclusion of 20 wt % of B4C. The mechanical action during wear test has created a loop shape with inner and outer radii on the surface of the laser deposited composites. The wear thickness, depth and COF were taken into cognisance; with sample C deposited at a laser power of 1.8 kW and scanning speed of 1 m/min having the lowest wear loss of 0.119 mm3. The substrate exhibited the shallowest wear depth and the reason is attributed the compressive nature of the material. The interlace of B4C in the titanium matrix has improved the properties the laser formed composites.
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Influence of laser power on improving the wear properties of laser deposited Ti-6Al-4V+B4C composite
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Laser metal deposition , Microstructure , Wear measurement
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/273312 , uj:29114 , Citation: Erinosho, M.F. & Akinlabi, E.T. 2018. Influence of laser power on improving the wear properties of laser deposited Ti-6Al-4V+B4C composite.
- Description: Abstract: Titanium and its alloys have possessed outstanding properties such as high specific strength, good oxidation and corrosion resistance; which have made them extensively suitable for use in the aeronautical, medical, automobile, marine and chemical industries. This paper presents the impact of laser power on the microstructure and the wear properties of titanium matrix Ti-6Al-4V+B4C composites. The laser powers were varied between 0.8 kW and 2.2 kW while keeping other contributing parameters constant. The microstructural effects were characterised with increasing α-Ti lamella and coarse Widmanstettan structures as the laser power was increased; alongside with the inclusion of 20 wt % of B4C. The mechanical action during wear test has created a loop shape with inner and outer radii on the surface of the laser deposited composites. The wear thickness, depth and COF were taken into cognisance; with sample C deposited at a laser power of 1.8 kW and scanning speed of 1 m/min having the lowest wear loss of 0.119 mm3. The substrate exhibited the shallowest wear depth and the reason is attributed the compressive nature of the material. The interlace of B4C in the titanium matrix has improved the properties the laser formed composites.
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Influence of laser power on microhardness and wear resistance properties of laser metal deposited 17-4 PH stainless steel
- Adeyemi, A., Akinlabi, Esther Titilayo, Mahamood, R.M.
- Authors: Adeyemi, A. , Akinlabi, Esther Titilayo , Mahamood, R.M.
- Date: 2018
- Subjects: Laser Metal Deposition , Laser Power , 17-4 PH stainless steel
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290921 , uj:31590 , Citation: Adeyemi, A., Akinlabi, E.T. & Mahamood, R.M. 2018. Influence of laser power on microhardness and wear resistance properties of laser metal deposited 17-4 PH stainless steel.
- Description: Abstract: This aim of this research is to investigate the impact of laser power on the hardness and the wear resistance properties of laser metal deposited 17-4 PH stainless steel. Hardness was studied using Zwick/Roell microhardness tester and the wear resistance property was carried out using ball-on-disc Anton Paar-tribometer wear tester. The study revealed that an irregular increase and decrease in the average hardness value and wear behaviour were observed. This could be attributed to the presence of copper precipitate which was more concentrate at the overlapping region because of the reheating activity that is happening between the succeeding and preceding track layers.
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- Authors: Adeyemi, A. , Akinlabi, Esther Titilayo , Mahamood, R.M.
- Date: 2018
- Subjects: Laser Metal Deposition , Laser Power , 17-4 PH stainless steel
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290921 , uj:31590 , Citation: Adeyemi, A., Akinlabi, E.T. & Mahamood, R.M. 2018. Influence of laser power on microhardness and wear resistance properties of laser metal deposited 17-4 PH stainless steel.
- Description: Abstract: This aim of this research is to investigate the impact of laser power on the hardness and the wear resistance properties of laser metal deposited 17-4 PH stainless steel. Hardness was studied using Zwick/Roell microhardness tester and the wear resistance property was carried out using ball-on-disc Anton Paar-tribometer wear tester. The study revealed that an irregular increase and decrease in the average hardness value and wear behaviour were observed. This could be attributed to the presence of copper precipitate which was more concentrate at the overlapping region because of the reheating activity that is happening between the succeeding and preceding track layers.
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Influence of reinforcements in friction stir processed magnesium alloys : insight in medical applications
- Adetunla, Adedotun, Akinlabi, Esther Titilayo
- Authors: Adetunla, Adedotun , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Composites , Magnesium , Mechanical properties
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/289865 , uj:31458 , Citation: Adetunla, A. & Akinlabi, E. 2018. Influence of reinforcements in friction stir processed magnesium alloys : insight in medical applications.
- Description: Abstract: Magnesium alloy shows great potential in medical devices such as wound closing devices, bone grafts and cardiovascular stents owing to its mechanical and biodegradable properties. However, its clinical applications are limited due to its biocompatibility and rapid corrosion. Since material corrosion and biocompatibility can be categorized under surface properties of biomaterials, this study employed a surface modification method to fabricate new alloys. Reinforcement of magnesium alloys with powders have engineered a new type of material regarded as metal matrix composites...
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- Authors: Adetunla, Adedotun , Akinlabi, Esther Titilayo
- Date: 2018
- Subjects: Composites , Magnesium , Mechanical properties
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/289865 , uj:31458 , Citation: Adetunla, A. & Akinlabi, E. 2018. Influence of reinforcements in friction stir processed magnesium alloys : insight in medical applications.
- Description: Abstract: Magnesium alloy shows great potential in medical devices such as wound closing devices, bone grafts and cardiovascular stents owing to its mechanical and biodegradable properties. However, its clinical applications are limited due to its biocompatibility and rapid corrosion. Since material corrosion and biocompatibility can be categorized under surface properties of biomaterials, this study employed a surface modification method to fabricate new alloys. Reinforcement of magnesium alloys with powders have engineered a new type of material regarded as metal matrix composites...
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Influence of surface treatment on dry sliding wear behavior of hydrophobic silane coating on AISI 304
- Baruwa, A.D., Oladijo, O.P., Maledi, N., Akinlabi, Esther Titilayo
- Authors: Baruwa, A.D. , Oladijo, O.P. , Maledi, N. , Akinlabi, Esther Titilayo
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/290422 , uj:31528 , Citation: Baruwa, A.D. et al. 2018. Influence of surface treatment on dry sliding wear behavior of hydrophobic silane coating on AISI 304.
- Description: Abstract: Henicosyl-1,1,2,2-tetrahydrododecyltricholrosilane is a hydrophobic silane compound coated on AISI 304 substrate. The surface of the substrate was treated in two ways (silicon oxide and plasma oxide) for adhesion and interface between the inorganic substrate and organic coating. The wear performance of the coating as a comparison to the AISI 304 was investigated using vacuum tribometer and characterized by scanning electron microscope and atomic force microscope. The result showed that the silane compound did improve the wear property of the AISI 304 stainless steel. It also proved that silane can be used as wear resistance agent.
- Full Text:
- Authors: Baruwa, A.D. , Oladijo, O.P. , Maledi, N. , Akinlabi, Esther Titilayo
- Date: 2018
- Language: English
- Type: Conference proceeding
- Identifier: http://hdl.handle.net/10210/290422 , uj:31528 , Citation: Baruwa, A.D. et al. 2018. Influence of surface treatment on dry sliding wear behavior of hydrophobic silane coating on AISI 304.
- Description: Abstract: Henicosyl-1,1,2,2-tetrahydrododecyltricholrosilane is a hydrophobic silane compound coated on AISI 304 substrate. The surface of the substrate was treated in two ways (silicon oxide and plasma oxide) for adhesion and interface between the inorganic substrate and organic coating. The wear performance of the coating as a comparison to the AISI 304 was investigated using vacuum tribometer and characterized by scanning electron microscope and atomic force microscope. The result showed that the silane compound did improve the wear property of the AISI 304 stainless steel. It also proved that silane can be used as wear resistance agent.
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Investigation of oil drill cuttings as partial replacement of cements in concrete for low strength structures
- Ikotun, Jacob Olumuyiwa, Okeniyi, Joshua Olusegun, Akinlabi, Esther Titilayo, Akinlabi, Stephen Akinwale, Okeniyi, Elizabeth Toyin, Olanrewaju, Deborah Olukemi, Udoye, Nduka Ekene, Dirisu, Joseph Osekhogene
- Authors: Ikotun, Jacob Olumuyiwa , Okeniyi, Joshua Olusegun , Akinlabi, Esther Titilayo , Akinlabi, Stephen Akinwale , Okeniyi, Elizabeth Toyin , Olanrewaju, Deborah Olukemi , Udoye, Nduka Ekene , Dirisu, Joseph Osekhogene
- Date: 2018
- Subjects: Concrete , Oil drill cutting , Cement
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290617 , uj:31553 , Citation: Jacob Olumuyiwa Ikotun, Joshua Olusegun Okeniyi, Esther Titilayo Akinlabi, Stephen Akinwale Akinlabi, Elizabeth Toyin Okeniyi and Deborah Olukemi Olanrewaju, Nduka Ekene Udoye, Joseph Osekhogene Dirisu, Investigation of Oil Drill Cuttings as Partial Replacement of Cements in Concrete for Low Strength Structures. International Journal of Civil Engineering and Technology, 9(10), 2018, pp. xx-xx. http://www.iaeme.com/IJCIET/issues.asp?JTypeIJCIET&VType=9&IType=10
- Description: Abstract: This study investigates the use of oil drill cuttings (ODC) as partial replacement of Portland cement (PC) and cementitious materials in binary and ternary cement compositions. Concrete specimens were prepared incorporating 0, 5, 10 and 20% by mass of ODC replacements in Portland cement (PC) and 10% of the ODC replacement in specimens having ground granulated blast furnace slag (GGBS) and pulverised fly ash (PFA) respectively. The fresh and hardened state properties of the concretes were studied. Results showed that use of ODC contributed improvements to the fresh concrete properties, while it also exhibited good comparisons of hardened concrete properties with the non- ODC containing concretes. Findings in the study support the use of ODCcontaining concrete mixes for low strength structures such as foundation blinding and infilling materials, in structural fills applications requiring no future excavations. These combined the advantages of cost reduction in concrete production with utilization of the waste ODC materials, which is a considerable...
- Full Text:
- Authors: Ikotun, Jacob Olumuyiwa , Okeniyi, Joshua Olusegun , Akinlabi, Esther Titilayo , Akinlabi, Stephen Akinwale , Okeniyi, Elizabeth Toyin , Olanrewaju, Deborah Olukemi , Udoye, Nduka Ekene , Dirisu, Joseph Osekhogene
- Date: 2018
- Subjects: Concrete , Oil drill cutting , Cement
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/290617 , uj:31553 , Citation: Jacob Olumuyiwa Ikotun, Joshua Olusegun Okeniyi, Esther Titilayo Akinlabi, Stephen Akinwale Akinlabi, Elizabeth Toyin Okeniyi and Deborah Olukemi Olanrewaju, Nduka Ekene Udoye, Joseph Osekhogene Dirisu, Investigation of Oil Drill Cuttings as Partial Replacement of Cements in Concrete for Low Strength Structures. International Journal of Civil Engineering and Technology, 9(10), 2018, pp. xx-xx. http://www.iaeme.com/IJCIET/issues.asp?JTypeIJCIET&VType=9&IType=10
- Description: Abstract: This study investigates the use of oil drill cuttings (ODC) as partial replacement of Portland cement (PC) and cementitious materials in binary and ternary cement compositions. Concrete specimens were prepared incorporating 0, 5, 10 and 20% by mass of ODC replacements in Portland cement (PC) and 10% of the ODC replacement in specimens having ground granulated blast furnace slag (GGBS) and pulverised fly ash (PFA) respectively. The fresh and hardened state properties of the concretes were studied. Results showed that use of ODC contributed improvements to the fresh concrete properties, while it also exhibited good comparisons of hardened concrete properties with the non- ODC containing concretes. Findings in the study support the use of ODCcontaining concrete mixes for low strength structures such as foundation blinding and infilling materials, in structural fills applications requiring no future excavations. These combined the advantages of cost reduction in concrete production with utilization of the waste ODC materials, which is a considerable...
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Laser metal deposition of titanium aluminide composites : a review
- Abdulrahman, Kamardeen O., Akinlabi, Esther Titilayo, Mahamood, Rasheedat M., Pityana, Sisa, Tlotleng, Monnamme
- Authors: Abdulrahman, Kamardeen O. , Akinlabi, Esther Titilayo , Mahamood, Rasheedat M. , Pityana, Sisa , Tlotleng, Monnamme
- Date: 2018
- Subjects: Titanium aluminide composites , Laser metal deposition , Additive manufacturing processes
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/291200 , uj:31618 , Citation: Abdulrahman, K.O. et al. 2018. Laser metal deposition of titanium aluminide composites : a review.
- Description: Abstract: Development of additive manufacturing (AM) from three dimensional printers with ability of producing parts having no need for tooling continue to wax stronger in the manufacturing field. Laser metal deposition, a technique in AM is usually employed to create solid components from model of computer aided design (CAD). Feeding powder supported by shielding gas employed by this technique, is injected into a melt pool produced by accurately focused laser beam on a substrate. This paper discusses some of the AM technologies available, review on laser metal deposition of titanium aluminide on other metals and alloys, relationship between the processing parameters and structural and mechanical properties
- Full Text:
- Authors: Abdulrahman, Kamardeen O. , Akinlabi, Esther Titilayo , Mahamood, Rasheedat M. , Pityana, Sisa , Tlotleng, Monnamme
- Date: 2018
- Subjects: Titanium aluminide composites , Laser metal deposition , Additive manufacturing processes
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/291200 , uj:31618 , Citation: Abdulrahman, K.O. et al. 2018. Laser metal deposition of titanium aluminide composites : a review.
- Description: Abstract: Development of additive manufacturing (AM) from three dimensional printers with ability of producing parts having no need for tooling continue to wax stronger in the manufacturing field. Laser metal deposition, a technique in AM is usually employed to create solid components from model of computer aided design (CAD). Feeding powder supported by shielding gas employed by this technique, is injected into a melt pool produced by accurately focused laser beam on a substrate. This paper discusses some of the AM technologies available, review on laser metal deposition of titanium aluminide on other metals and alloys, relationship between the processing parameters and structural and mechanical properties
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