A review : plastic deformation through equal channel angular pressing
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Microstructural evolution , Severe plastic deformation , Strain path
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/92397 , uj:20225 , Citation: Erinosho, M.F. & Akinlabi, E.T. 2016. A review : plastic deformation through equal channel angular pressing.
- Description: Abstract: In most manufacturing processes, objects of the required shape and size are produced through plastic deformation; sometimes by deforming the product itself through rolling, extrusion, drawing etc, and by deforming the metal removed through grinding, milling and cutting operation. In these processes, a load of appreciable magnitude is applied on the material subjected to deformation, and the plastic flow thus produced is suitably restricted to get the desired shape and size. Equal Channel Angular Pressing (ECAP) is very capable of producing ultrafine grained microstructures and improves the mechanical properties of the deformed materials. The variations in strain path directions during deformation have significantly effect on the physical and mechanical response of distorted metals.
- Full Text:
Analysis of the influence of the laser power on the microstructure and properties of titanium alloy - reinforced boron carbide matrix composite (Ti6Al4V-B4C)
- 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.
- Full Text:
Behaviour of laser metal deposited Ti6Al4V/Cu composites in hank’s solution for biocompatibility properties
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Pityana, Sisa
- Date: 2016
- Subjects: Hank’s solution , Laser metal deposition , Microhardness
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/215427 , uj:21416 , Citation: Erinosho, M.F., Akinlabi, E.T & Pityana, S. 2016. Behaviour of laser metal deposited Ti6Al4V/Cu composites in hank’s solution for biocompatibility properties.
- Description: Abstract: Ti6Al4V alloy is a well-known material for biomedical application due to the very excellent corrosion resistance it possessed. Copper is an excellent antimicrobial property and has been found to stabilize the immune system of the body activities. In this present study, laser metal deposition of Ti6Al4V/Cu composites have been conducted by varying the laser power between 600 W and 1800 W while the scanning speed of 0.005 m/s and other process parameters as depicted in the experimental matrix were kept constant. Widmanstettan structures were observed in all the samples at high magnification and lose their coarseness as the laser power increases. The microhardness values of the deposited composites were varied between HV335 ± 27 μm and HV490 ± 73 μm. The surface behaviour and the morphologies of the composites were evaluated under the SEM after soaking for 2 weeks. The simulated body fluid (hank’s solution) was maintained at normal body temperature of about 37±1oC. The surfaces showed fracture topography with porous bone-like and snowflake structures.
- Full Text:
Central composite design on volume of laser metal deposited Ti6Al4V and Cu
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo
- Date: 2017
- Subjects: Laser metal deposition , Response surface methodology , Central composite design
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/236159 , uj:24162 , Citation: Erinosho, M.F. & Akinlabi, E.T. 2017. Central composite design on volume of laser metal deposited Ti6Al4V and Cu.
- Description: Abstract: Laser technology process is a pulsating practice to the field of engineering and in all paces of lifespan; since it can travel a longer distance and be focused to a very small bright spot that exceeds the illumination of the sun. This present study reports the modeling and the prediction of the volume of laser deposited composites using the central composite design (CCD). Four input factors were put into consideration which is the laser power, the scanning speed, the powder flow rate and the gas flow rate. Titanium alloy (Ti6Al4V) and copper (Cu) have been coaxially deposited to form a bulk of single clad. The factors considered determine the energy density and the melt pool delivered into the substrate and as such, influenced the volume of the deposited composite (VDC) which was employed in the response surface methodology (RSM) design. This has been used to predict the actual process parameters for the optimum process setting.
- Full Text:
Effect of laser power on the microstructural behaviour and strength of modified laser deposited Ti6Al4V+CU alloy for medical application
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Laser metal deposition , Microstructure , Microhardness
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/121883 , uj:20577 , Citation: Erinosho, M.F. & Akinlabi, E.T. 2016. Effect of laser power on the microstructural behaviour and strength of modified laser deposited Ti6Al4V+CU alloy for medical application.
- Description: Abstract: Please refer to full text to view abstract
- Full Text:
Effect of powder density variation on premixed Ti-6Al-4V and Cu composites during laser metal deposition
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Pityana, Sisa
- Date: 2016
- Subjects: Powder density , Laser metal deposition , Titanium alloys , Copper
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/123406 , uj:20787 , Citation: Erinosho, M.F., Akinlabi, E.T & Pityana, S. 2016. Effect of powder density variation on premixed Ti-6Al-4V and Cu composites during laser metal deposition.
- Description: Abstract: This paper reports the effect of powder density variation on the premixed Ti-6Al-4V/Cu and Ti-6Al-4V/2Cu Composites. Two sets of experiment were conducted in this study. Five deposits each were made for the two premixed composites. Laser powers were varied between 600 W and 1700 W while a scanning speed of 0.3 m/min is kept constant throughout the experiment. Investigations were conducted on the microstructures and microhardness of the laser deposited premixed Ti-6Al-4V/Cu and Ti-6Al-4V/2Cu composites. It was found that the evolving microstructures of the composites were characterised with the formation of macroscopic banding and Widmanstatten; and disappears as it grows towards the fusion zone (FZ) and this could be attributed to the changes in the distribution of heat input. Sample A2 of premixed Ti-6Al-4V/Cu composite gives the highest hardness of 393 ± 6.36VHN0.5 while sample B4 of premixed Ti-6Al-4V/2Cu composites depicts the highest hardness value of 373 ± 9.18VHN0.5.
- Full Text:
Effect of scanning speed and powder flow rate on the evolving properties of laser metal deposited ti-6al-4v/cu composites
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Pityana, Sisa
- Date: 2016
- Subjects: Hardness , High pfr , Laser metal deposition , Microstructure , Porosity , Volume of deposited composite
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/93307 , uj:20331 , Citation: Erinosho, M.F., Akinlabi, E.T. & Pityana, S. 2016. Effect of scanning speed and powder flow rate on the evolving properties of laser metal deposited ti-6al-4v/cu composites.
- Description: Abstract: In Laser Metal Deposition (LMD), good bonding between two similar or dissimilar materials can be achieved if the interrelationships between the processing parameters are well understood. LMD samples of titanium alloy, Ti-6Al-4V and copper, Cu were produced by varying the scanning speed and keeping other parameters constant. The deposited samples were characterized through the volume of deposited composites, microstructure, microhardness and the degree of porosity. The effect of the optimized high (powder flow rate) PFR, scanning speed varying from 0.06 m/min to 1.2 m/min and a constant power of 1kW led to a degree of porosity on the deposited composites. The varying percentages of porosities in the samples have an advance merit effect in the implantation of bones in animal and human. It was found that the existence of pores reduced as the scanning speed increases. The Vickers mirohardness was observed to increase with an increase in the scanning speed which shows an improvement in the properties of the Ti-6Al-4V/Cu composites. At low scanning velocity, the microstructure appears coarse due to the high rate of powder deposited at the same power of 1kW. The α-phase acicular microstructure decreases in size and thickness with an increase in the scanning speed. Widmanstätten structure was found in the scanning electron microscopy analyses. The results show that high PFR and low scanning speed have significantly influenced the evolving properties of the deposited composites.
- Full Text:
Effect of scanning speed on the material characterizations of laser deposited titanium alloy and copper
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Johnson, Oluwagbenga , Owolabi, Gbadebo
- Date: 2017
- Subjects: Laser metal deposition , Microstructure , Micro-hardness measurements
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/251738 , uj:26225 , Citation: Erinosho, M.F., Akinlabi, E.T., Johnson, O. & Owolabi, G. 2017. Effect of scanning speed on the material characterizations of laser deposited titanium alloy and copper.
- Description: Abstract: Laser Metal Deposition (LMD) belongs to a class of advanced materials that are manufactured using additive manufacturing techniques. Titanium alloy (T64) is commonly used for aerospace, marine, biomedical and automotive components due to its combined amazing properties. Copper (Cu) is a beta phase stabilizer and its behaviour in the alloy has been studied. This paper focuses on the influence of scanning speed on the laser deposited titanium alloy and copper composites (T6450Cu50). Equal weight proportion of T6450Cu50 was deposited on T64 substrate by varying the scanning speed from 0.5 m/min to 2 m/min while other parameters are kept constant. The microstructural behaviour and the microhardness measurement have been investigated and reported. The interaction time between the nozzle and the substrate during laser deposition determines on the depth and width of the heat affected zone; the melt pool created on the substrate has also influenced the meld of the participating powders to the substrate. The relationship between the scanning speed and the deposited area has provided a way of controlling the desired deposit range during manufacturing or the repair of a component.
- Full Text:
Estimation of surface topography and wear loss of laser metal deposited Ti6Al4V and Cu
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Laser metal deposition , Microstructure , Surface roughness topography
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/214314 , uj:21265 , Citation: Erinosho, M.F & Akinlabi, E.T. 2016. Estimation of surface topography and wear loss of laser metal deposited Ti6Al4V and Cu.
- Description: Abstract: The atomic force microscopy (AFM) analysis is a process that involves the detailed analyses of the surface of a three dimensional sample piece. A good image is always generated on such a sample once the settings are implemented correctly. And as such, the amplitude set point played a vital role in achieving a better image. For surface engineering applications, a small proportion of Cu has been added to Ti6Al4V alloy and deposited using a 2kW Ytterbium Fibre Laser. This paper presents the evolving microstructures and the surface topographies of the laser deposited Ti6Al4V/Cu alloys. The formation and the output of the microstructure depend on the laser processing parameters employed. The α-Ti lamella formed was observed to gain coarseness with respect to the increase in the laser power. The migration of the β-phase has been impeded during solidification due to the low strain hardening effect posed by the α-Ti lamella thereby limiting the further dislocation of the β-phase within the crystal structure. A clear picture of the height, amplitude and the phase shift of the scanned sample were viewed before a capture can be made. A correlation between wear loss and surface roughness has been established among the laser deposited samples.
- Full Text:
Exploration of microstructure and wear behaviours of laser metal deposited Ti6Al4V/Cu composites
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Pityana, Sisa
- Date: 2016
- Subjects: Dry sliding wear , Laser metal deposition , Microstructures
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/215408 , uj:21415 , Citation: Erinosho, M.F., Akinlabi, E.T & Pityana, S. 2016. Exploration of microstructure and wear behaviours of laser metal deposited Ti6Al4V/Cu composites.
- Description: Abstract: This paper reports on the investigations conducted on the evolving microstructures and the dry sliding wear of the laser deposited Ti6Al4V/Cu composites. Some selected process parameters were used for the experiments. The laser powers were chosen between 1300 W and 1600 W; scanning speeds were selected between 0.30 m/min and 0.72 m/min while other parameters are as specified in the experimental matrix. It was found that all the composites produced showed good and high-quality microstructures and they exhibited very low or no fusion zones which were as a result of the selected process parameters used. The α-phase region of the composites was found to be harder than the β-phase region. During the composites cooling, the β-phase field transformed to the basal planes of the hexagonal α-phase thereby creating a lower diffusion coefficient of the α-phase as compared to the β-phase counterpart. The Ti6Al4V/Cu composite produced at a laser power of 1397 W and a scanning speed of 0.3 m/min was found to show the lowest percentage of wear volume and coefficient of friction; and happened due to the martensitic structure formed during cooling. Results obtained showed that the poor abrasive wear of titanium alloy has been improved with the addition of copper into their lattices.
- Full Text:
Influence of dynamical analysis of laser power on titanium alloy with boron carbide (Ti6Al4V-B4C) metal matrix composites
- Authors: Ogunlana, Musibau O. , Akinlabi, Esther Titilayo , Erinosho, Mutiu F.
- Date: 2017
- Subjects: B4C powder , Dry sliding wear , Laser metal deposition (LMD)
- Language: English
- Identifier: http://hdl.handle.net/10210/233878 , uj:23889 , Citation: Ogunlana, M.O., Akinlabi, E.T. & Erinosho, M.F. 2017. Influence of dynamical analysis of laser power on titanium alloy with boron carbide (Ti6Al4V-B4C) metal matrix composites. Journal of Mechanical Engineering.
- Description: Abstract: LMD process is a means of producing metal composites with the aid of laser beam and powder fusing together. In this research work, Ti6Al4V alloy is fused with 10 wt % of B4C in order to form metal matrix composites (MMCs), and 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 composites were characterized through the surfacing microstructure, microhardness and dry sliding wear. The microstructural properties of the deposited samples were profound with α-Ti, β-Ti and intermetallic phase of (α+β) of titanium alloy and boron carbide particles. The microhardness tests revealed that the composites deposited with a laser power of 2000 W exhibited the highest hardness value of HV 471. Furthermore characterisation revealed that the sample produced with the laser power of 800 W produced the lowest wear loss and wear rate of 35.2 x 10-3 mm3 and 6.42 x 10-4 mm3/Nm. However, this paper presents a detailed study on the LMD of Ti6Al4V-B4C composites in order to improve the material properties for surface engineering applications.
- Full Text:
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.
- Full Text:
Influence of laser power on the surfacing microstructures and microhardness properties of Ti-6Al-4V-Cu alloys using the ytterbium fiber laser
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo
- Date: 2017
- Subjects: Laser metal deposition , Microhardness , Microstructures
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/233106 , uj:23793 , Citation: Erinosho, M.F. & Akinlabi, E.T. 2017. Influence of laser power on the surfacing microstructures and microhardness properties of Ti-6Al-4V-Cu alloys using the ytterbium fiber laser. 5th International Conference of Materials Processing and Characterization (ICMPC 2016).
- Description: Abstract: Laser Metal Deposition (LMD) is a route that involves the spraying of metallic powders onto a substrate with the application of beam of light. The deposition of titanium alloy (Ti-6Al-4V) with five weight percent (5 wt %) of copper (Cu) has been explored and characterized through the developing microstructures and microhardness. A constant scanning speed of 0.3 m/min and laser powers varied between 400 W and 1600 W were used for the process parameters. The Widmanstatten structures were even at low laser powers and later increased in their coarseness and propagate further as the laser power increases; and the occurrence can be attributed to the further increase in the heat input from the top of the clad to the substrate and the slow cooling rate within the cladded zone of the composites. A typical sample D4 deposited with a laser power of 1000 W exhibits the highest hardness value of 541 ± 88 HV0.5 while sample D2 deposited at a laser power of 600 W depicts the lowest hardness value of 448 ± 58 HV0.5. The properties of the Ti-6Al-4V-Cu alloys have been improved and can be recommended for marine application.
- Full Text:
Influence of laser scanning speed on the rotary wear behaviour of deposited Ti6Al4V alloy and Cu
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Mubiayi, Mukuna P. , Owolabi, Gbadebo
- Date: 2017
- Subjects: Cu , Laser metal deposition , Wear measurement
- Language: English
- Type: Conference proceedings
- Identifier: http://ujcontent.uj.ac.za8080/10210/371820 , http://hdl.handle.net/10210/251731 , uj:26224 , Citation: Erinosho, M.F., Akinlabi, E.T., Mubiayi, M.P. & Owolabi, G. 2017. Influence of laser scanning speed on the rotary wear behaviour of deposited Ti6Al4V alloy and Cu.
- Description: Abstract: Laser metal deposition (LMD) is an additive manufacturing technology that involves the combination of metallic powder and laser beam for its consolidation. The process parameters involved in LMD need to be well understood and implemented correctly before the optimal process can be achieved. This paper reports the effect of scanning speed on the wear behaviour of laser deposited samples. The rotary wear method was adopted in order to understand the relationship in the radii of the wear track. The scanning speeds were varied from 0.0083 m/sec to 0.0333 m/sec while the laser power of 1.0 kW, the powder flow rate of 1 rpm and the gas flow rate of 2 l/min were kept constant. Some lateral cracks were observed in the microstructure which was due to the effect of the thermal stress that was induced during cooling. The laser deposited samples are suitable for repair in marine industry as the manufacturing process will provide a great control to the desired material properties with superior performance.
- Full Text:
Influence of scanning speed and energy density on the evolving properties of laser deposited Ti6Al4V/Cu composites
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Pityana, Sisa
- Date: 2015-07-01
- Subjects: Laser metal deposition , Microhardness , Titanium composites , Copper composites
- Type: Article
- Identifier: uj:5131 , ISBN 9789881404701 , http://hdl.handle.net/10210/14094
- Description: Titanium is a light metal and finds application majorly in the aerospace and bio medicals. This paper presents the influence of scanning speed and energy density on the evolving microstructure and microhardness of laser deposited Ti6Al4V/Cu composites. The laser power, powder flow rates and gas flow rates were kept constant while varying the scanning speed. From the microscopic analysis, α acicular structures were found growing from the top of the cross section of the composite and broke into the β-phase and the grain boundary of the (α+β) phase, and found to disappear gradually as the scanning speed increases. Widmanstettan was also found in all the samples. Sample S21 of energy density 240 J/mm2 deposited with a laser power of 1200 W and a scanning speed of 5 mm/secs shows the highest hardness value of 541±20 HV0.5 while Sample S27 of energy density of 48 J/mm2 deposited with a laser power of 1200 W and a scanning speed of 25 mm/secs shows the lowest hardness value of 405±12 HV0.5. This was attributed to the Cu content added and plays a vital role in stabilizing and strengthening the β-phase.
- Full Text:
Laser metal deposition of Ti6Al4V/Cu composite : a study of the effect of laser power on the evolving properties
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Pityana, Sisa
- Date: 2014
- Subjects: Porosity , Laser metal deposition , Titanium alloys
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/375937 , uj:4740 , ISSN 978-93-81505-62-5 , http://hdl.handle.net/10210/11726
- Description: A study of the effect of laser power was investigated over the volume of deposited composite, microstructure and microhardness. The laser power was varied between 600 and 1800 W while keeping all other parameters constant. An indication shows that the area and the volume of the deposited composites are directly proportional to the laser power employed. The volume of the deposit obtained falls between 358.6 mm3 and 1009 mm3. The microstructures were analyzed and found that the formation of the Widmanstatten structures improved the hardness of Ti6Al4V/Cu composites. The hardness values of the deposits varied between HV335 and HV490. The percentages of porosities of the samples were also presented and found to have an inverse relationship with the laser power. The results are presented and discussed.
- Full Text:
Microstructures and dry sliding wear characteristics of the laser metal deposited Ti6Al4V/Cu composites
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo , Pityana, Sisa
- Date: 2015
- Subjects: Dry sliding wear , Laser metal deposition , Microstructures , Titanium composites , Copper composites
- Type: Article
- Identifier: uj:5139 , http://hdl.handle.net/10210/14106
- Description: This paper reports on the investigations conducted on the evolving microstructures and the dry sliding wear of the laser deposited Ti6Al4V/Cu composites. Some selected process parameters were used for the experiments. The laser powers were chosen between 1300 W and 1600 W; scanning speeds were selected between 0.30 m/min and 0.72 m/min while other parameters are as specified in the experimental matrix. It was found that all the composites produced showed good and high-quality microstructures and they exhibited very low or no fusion zones which were as a result of the selected process parameters used. The composite produced at a laser power of 1397 W and a scanning speed of 0.3 m/min was found to show the lowest percentage of wear volume and coefficient of friction; and happened due to the martensitic structure formed during cooling. Results obtained showed that the poor abrasive wear of titanium alloy has been improved with the addition of copper into their lattices.
- Full Text:
Non-destructive residual stress analysis and microstructural behaviour of laser deposited titanium and copper alloy
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo
- Date: 2017
- Subjects: Laser metal deposition , Microstructures , Residual stress
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/233517 , uj:23842 , Citation: Erinosho, M.F. & Akinlabi, E.T. 2017. Non-destructive residual stress analysis and microstructural behaviour of laser deposited titanium and copper alloy. 5th International Conference of Materials Processing and Characterization (ICMPC 2016).
- Description: Abstract: Titanium alloy (Grade 5) has been regarded as the most useful alloys for the aerospace applications, due to their light weight properties. The addition of copper to this alloy allows the improvement in the mechanical properties. The increase in the laser power has influenced the coarseness of the α-Ti lamella; and thus slows down the cooling rate during solidification. The X ray diffraction method has been used to analyse the residual stresses using the biaxial and shear-stressed model. Very infinitesimal microns were taken into consideration for the penetration depth. The results generated indicate that a decrease in the compressive residual stresses is attributed to the increase in the laser power and the variation of the heat input within the clad during processing. The differences in the thermal expansion with respect to the increase in the volume of deposition as the laser power increases have significant effect on the compressive residual stress.
- Full Text:
Study of friction during forging operation
- Authors: Erinosho, Mutiu F. , Akinlabi, Esther Titilayo
- Date: 2016
- Subjects: Double cup extrusion , Friction factor , Lubrication
- Language: English
- Type: Conference proceedings
- Identifier: http://ujcontent.uj.ac.za8080/10210/375142 , http://hdl.handle.net/10210/92406 , uj:20226 , Citation: Erinosho, M.F. & Akinlabi, E.T. 2016. Study of friction during forging operation.
- Description: Abstract: This paper presents a review on the effect of friction during forging operation; must especially the double cup extrusion process. The metal forming process, such as forging, is one of the manufacturing processes where metal is pressed or forced under great pressure into high strength parts. Before the process, lubricant is applied to the dies in operation to promote the flow of metal, to reduce friction and wear, and to aid in the release of the finished part. Interfacial friction between the forgings dies and the workpiece such as billet has a significant effect on the forging applications, forming quality, and deformation loads. The most commonly used lubricant is liquid based lubricant, such as water-based graphite, synthetic oils, liquid soap, shear butter etc. Under the high pressure condition and reductions of the lubricant film often breaks down the operation and caused poor metal flow and wears. High interface friction is a primary cause for adhesive pickup in cold forging.
- Full Text:
Study on microstructure and mechanical properties of 304 stainless steel joints by TIG-MIG hybrid welding
- Authors: Ogundimu, Emmanuel O. , Akinlabi, Esther Titilayo , Erinosho, Mutiu F.
- Date: 2017
- Subjects: 304 austenitic stainless steel , MIG welding , TIG welding
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/237818 , uj:24372 , Citation: Ogundimu, E.O., Akinlabi, E.T. & Erinosho, M.F. 2017. Study on microstructure and mechanical properties of 304 stainless steel joints by TIG-MIG hybrid welding.
- Description: Abstract: Stainless steel is a family of Fe-based alloys having excellent resistance to corrosion, and as such has been used imperatively for kitchen utensils, transportation, building constructions and much more. This paper presents the work conducted on the material characterizations of a TIG-MIG hybrid welded joint of type 304 austenitic stainless steel. The welding processes were conducted in three phases. The phases of welding employed are MIG welding using a current of 170A, TIG welding using the current of 190A, and a hybrid TIG-MIG welding with currents of 190/170A respectively. The MIG, TIG, and hybrid TIG-MIG weldments were characterized with incomplete penetration, full penetration and excess penetration of weld. Intergranular austenite was created towards the transition zone and the HAZ. The thickness of the delta ferrite (δ-Fe) formed in the microstructures of the TIG weld is more than the thickness emerged in the microstructures of MIG weld and hybrid TIG-MIG welds. A TIG-MIG hybrid weld of specimen welded at the currents of 190/170A has the highest UTS value and percentage elongation of 397.72 MPa and 35.7 %. The TIG-MIG hybrid welding can be recommended for high-tech industrial applications such as nuclear, aircraft, food processing, and automobile industry.
- Full Text: