Corrosion resistance of heat treated Ti6Al4V in NaCl
- Omoniyi, P.O., Akinlabi, E.T., Mahamood, R.M., Jen, T.C.
- Authors: Omoniyi, P.O. , Akinlabi, E.T. , Mahamood, R.M. , Jen, T.C.
- Date: 2021
- Subjects: Corrosion , Heat treatment , Ti6Al4V
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/485969 , uj:44190 , DOI: 10.1016/j.cdc.2021.100780 , Citation: P.O. Omoniyi, E.T. Akinlabi, R.M. Mahamood, T.C. Jen, Corrosion resistance of heat treated Ti6Al4V in NaCl, Chemical Data Collections, Volume 36, 2021, https://doi.org/10.1016/j.cdc.2021.100780.
- Description: Abstract: Please refer to full text to view abstract.
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- Authors: Omoniyi, P.O. , Akinlabi, E.T. , Mahamood, R.M. , Jen, T.C.
- Date: 2021
- Subjects: Corrosion , Heat treatment , Ti6Al4V
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/485969 , uj:44190 , DOI: 10.1016/j.cdc.2021.100780 , Citation: P.O. Omoniyi, E.T. Akinlabi, R.M. Mahamood, T.C. Jen, Corrosion resistance of heat treated Ti6Al4V in NaCl, Chemical Data Collections, Volume 36, 2021, https://doi.org/10.1016/j.cdc.2021.100780.
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Influence of laser power and traverse speed on weld characteristics of laser beam welded Ti-6Al-4V sheet
- Mashinini, P. M., Hattingh D. G.
- Authors: Mashinini, P. M. , Hattingh D. G.
- Date: 2018
- Subjects: Laser beam welding , Ti6Al4V , Traverse speed
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/273269 , uj:29109 , Citation: Mashinini, P.M. & Hattingh D.G. 2018. Influence of laser power and traverse speed on weld characteristics of laser beam welded Ti-6Al-4V sheet. Materials Research Proceedings 4 (2018) 59-64 doi: http://dx.doi.org/10.21741/9781945291678-9.
- Description: Abstract: In this paper laser beam welding was used for joining 3 mm Ti-6Al-4V alloy sheets in a full penetration butt-weld configuration. Laser beam power and traverse speed were the only parameters varied in an attempt to characterize the influence on weld integrity with specific reference to residual stress and microstructural modifications. The iXRD residual stress data showed a definite influence of traverse speed on residual stresses, with low traverse speeds resulting in an increased tensile residual stresses in the longitudinal direction of the weld whilst in the transverse direction residual stress revealed a more compressive stress state. The residual stress data for this experiment compared favourably with published residual stresses data done by synchrotron X-ray diffraction. Weld joint integrity was further analyzed by evaluating the microstructure transformation in the weld nugget. These results revealed a degree of grain growth and the presences of fine acicular b (needle-like a) in prior b grain boundaries with increased traverse speed. Grain growth was predominantly influenced by the cooling rate which is associated with traverse speed. Additionally, the a-phase and b-phase were characterized in the various weld zones by electron backscatter diffraction (EBSD).
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- Authors: Mashinini, P. M. , Hattingh D. G.
- Date: 2018
- Subjects: Laser beam welding , Ti6Al4V , Traverse speed
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/273269 , uj:29109 , Citation: Mashinini, P.M. & Hattingh D.G. 2018. Influence of laser power and traverse speed on weld characteristics of laser beam welded Ti-6Al-4V sheet. Materials Research Proceedings 4 (2018) 59-64 doi: http://dx.doi.org/10.21741/9781945291678-9.
- Description: Abstract: In this paper laser beam welding was used for joining 3 mm Ti-6Al-4V alloy sheets in a full penetration butt-weld configuration. Laser beam power and traverse speed were the only parameters varied in an attempt to characterize the influence on weld integrity with specific reference to residual stress and microstructural modifications. The iXRD residual stress data showed a definite influence of traverse speed on residual stresses, with low traverse speeds resulting in an increased tensile residual stresses in the longitudinal direction of the weld whilst in the transverse direction residual stress revealed a more compressive stress state. The residual stress data for this experiment compared favourably with published residual stresses data done by synchrotron X-ray diffraction. Weld joint integrity was further analyzed by evaluating the microstructure transformation in the weld nugget. These results revealed a degree of grain growth and the presences of fine acicular b (needle-like a) in prior b grain boundaries with increased traverse speed. Grain growth was predominantly influenced by the cooling rate which is associated with traverse speed. Additionally, the a-phase and b-phase were characterized in the various weld zones by electron backscatter diffraction (EBSD).
- Full Text: false
Influence of SiAlON ceramic reinforcement on Ti6Al4V alloy matrix via spark plasma sintering technique
- Falodun, Oluwasegun Eso, Oke, Samuel Ranti, Obadele, Babatunde Abiodun, Okoro, Avwerosuoghene Moses, Olubambi, Peter Apata
- Authors: Falodun, Oluwasegun Eso , Oke, Samuel Ranti , Obadele, Babatunde Abiodun , Okoro, Avwerosuoghene Moses , Olubambi, Peter Apata
- Date: 2019
- Subjects: Powder metallurgy , Ti6Al4V , SiAlON
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/406789 , uj:34215 , Citation: Falodun, O.E. et al. 2019 : Influence of SiAlON ceramic reinforcement on Ti6Al4V alloy matrix via spark plasma sintering technique. DOI: https://doi.org/10.1007/s12540-019-00553-3.
- Description: Abstract : The titanium-based composite was fabricated by strengthening Ti6Al4V alloy with addition of SiAlON ceramics utilizing spark plasma sintering technique. Ti6Al4V and SiAlON powders were mixed in a T2F Turbula mixer with different propor- tions (5, 10, 15 and 20 vol%) and the admixed powders were consolidated using spark plasma sintering to produce titanium matrix composites. The characterization of the sintered composites was performed using X-ray diffraction, optical microscopy and scanning electron microscopy. The influence of SiAlON additions on densification, microstructure, microhardness and fracture morphology were investigated on the sintered composites. The experimental results revealed that the densification of the sintered titanium matrix composites was in the range of 95%–98%, which decreased with an increase in SiAlON addition. However, an increase in microhardness values ranging from 363 to 574 HV0.1 was achieved. The microstructure shows that the SiAlON ceramic particle was uniformly distributed within the titanium matrix composites which comprises of a mixture of lamellar colonies with β grain boundaries. The fracture features of all composites exhibit mixed fracture of both intergranular and transgranular fracture mechanism.
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- Authors: Falodun, Oluwasegun Eso , Oke, Samuel Ranti , Obadele, Babatunde Abiodun , Okoro, Avwerosuoghene Moses , Olubambi, Peter Apata
- Date: 2019
- Subjects: Powder metallurgy , Ti6Al4V , SiAlON
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/406789 , uj:34215 , Citation: Falodun, O.E. et al. 2019 : Influence of SiAlON ceramic reinforcement on Ti6Al4V alloy matrix via spark plasma sintering technique. DOI: https://doi.org/10.1007/s12540-019-00553-3.
- Description: Abstract : The titanium-based composite was fabricated by strengthening Ti6Al4V alloy with addition of SiAlON ceramics utilizing spark plasma sintering technique. Ti6Al4V and SiAlON powders were mixed in a T2F Turbula mixer with different propor- tions (5, 10, 15 and 20 vol%) and the admixed powders were consolidated using spark plasma sintering to produce titanium matrix composites. The characterization of the sintered composites was performed using X-ray diffraction, optical microscopy and scanning electron microscopy. The influence of SiAlON additions on densification, microstructure, microhardness and fracture morphology were investigated on the sintered composites. The experimental results revealed that the densification of the sintered titanium matrix composites was in the range of 95%–98%, which decreased with an increase in SiAlON addition. However, an increase in microhardness values ranging from 363 to 574 HV0.1 was achieved. The microstructure shows that the SiAlON ceramic particle was uniformly distributed within the titanium matrix composites which comprises of a mixture of lamellar colonies with β grain boundaries. The fracture features of all composites exhibit mixed fracture of both intergranular and transgranular fracture mechanism.
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Laser butt welding of thin Ti6Al4V sheets: Effects of welding parameters
- Omoniyi, Peter, Mahamood, Rasheedat, Arthur, Nana, Pityana, Sisa, Skhosane, Samuel, Okamoto, Yasuhiro, Shinonaga, Togo, Maina, Martin, Jen, Tien-Chien, Akinlabi, Esther
- Authors: Omoniyi, Peter , Mahamood, Rasheedat , Arthur, Nana , Pityana, Sisa , Skhosane, Samuel , Okamoto, Yasuhiro , Shinonaga, Togo , Maina, Martin , Jen, Tien-Chien , Akinlabi, Esther
- Date: 2021
- Subjects: Laser welding , Ti6Al4V , microhardness
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/486143 , uj:44211 , Citation: Omoniyi, P.; Mahamood, R.; Arthur, N.; Pityana, S.; Skhosane, S.; Okamoto, Y.; Shinonaga, T.; Maina, M.; Jen, T.-C.; Akinlabi, E. Laser Butt Welding of Thin Ti6Al4V Sheets: Effects ofWelding Parameters. J. Compos. Sci. 2021, 5, 246. https:// doi.org/10.3390/jcs5090246 , DOI: 10.3390/jcs5090246
- Description: Abstract: Please refer to full text to view abstract.
- Full Text:
- Authors: Omoniyi, Peter , Mahamood, Rasheedat , Arthur, Nana , Pityana, Sisa , Skhosane, Samuel , Okamoto, Yasuhiro , Shinonaga, Togo , Maina, Martin , Jen, Tien-Chien , Akinlabi, Esther
- Date: 2021
- Subjects: Laser welding , Ti6Al4V , microhardness
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/486143 , uj:44211 , Citation: Omoniyi, P.; Mahamood, R.; Arthur, N.; Pityana, S.; Skhosane, S.; Okamoto, Y.; Shinonaga, T.; Maina, M.; Jen, T.-C.; Akinlabi, E. Laser Butt Welding of Thin Ti6Al4V Sheets: Effects ofWelding Parameters. J. Compos. Sci. 2021, 5, 246. https:// doi.org/10.3390/jcs5090246 , DOI: 10.3390/jcs5090246
- Description: Abstract: Please refer to full text to view abstract.
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Laser metal deposition of Ti6Al4V : a study on the effect of laser power on microstructure and microhardness
- Mahamood, Rasheedat M., Akinlabi, Esther Titilayo, Shukla, Mukul, Pityana, Sisa
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo , Shukla, Mukul , Pityana, Sisa
- Date: 2013
- Subjects: Laser metal deposition process , Laser power , Ti6Al4V , Macroscopic banding , Microhardness , Microstructure
- Type: Article
- Identifier: uj:4896 , http://hdl.handle.net/10210/12610
- Description: The effect of laser power on the resulting microstructure and microhardness of laser metal deposited Ti6Al4V powder on Ti6Al4V substrate has been investigated. The tracks were deposited using 99.6 % pure Ti6Al4V powder of particle size ranging between 150 - 200 μm on 99.6% Ti6Al4V substrate. The laser power was varied between 0.8 - 3.0 kW while the scanning speed, powder flow rate and the gas flow rate were kept at the values of 0.005 m/sec, 1.44 g/min and 4 l /min respectively. The microstructure and the microhardness were studied using the optical microscope and the Vickers hardness tester respectively. Layer band or macroscopic banding was observed in all the samples which is phenomenon as it was only reported in the literature for multi-layer deposits. The literature attributed re-melting of the previous layers by the succeeding layers as being responsible for their formation. This study has revealed that this band could be as a result of shrinkage happening in the fusion zone as a result of the interaction of the deposited powder and the melt pool created by the substrate material. This study also reveals the relationship between the microstructure, the average microhardness and the laser power which are comprehensively discussed. The higher the laser power, the lower the density of columnar prior beta grain structure. Also the average microhardness increases as the laser power increases.
- Full Text:
- Authors: Mahamood, Rasheedat M. , Akinlabi, Esther Titilayo , Shukla, Mukul , Pityana, Sisa
- Date: 2013
- Subjects: Laser metal deposition process , Laser power , Ti6Al4V , Macroscopic banding , Microhardness , Microstructure
- Type: Article
- Identifier: uj:4896 , http://hdl.handle.net/10210/12610
- Description: The effect of laser power on the resulting microstructure and microhardness of laser metal deposited Ti6Al4V powder on Ti6Al4V substrate has been investigated. The tracks were deposited using 99.6 % pure Ti6Al4V powder of particle size ranging between 150 - 200 μm on 99.6% Ti6Al4V substrate. The laser power was varied between 0.8 - 3.0 kW while the scanning speed, powder flow rate and the gas flow rate were kept at the values of 0.005 m/sec, 1.44 g/min and 4 l /min respectively. The microstructure and the microhardness were studied using the optical microscope and the Vickers hardness tester respectively. Layer band or macroscopic banding was observed in all the samples which is phenomenon as it was only reported in the literature for multi-layer deposits. The literature attributed re-melting of the previous layers by the succeeding layers as being responsible for their formation. This study has revealed that this band could be as a result of shrinkage happening in the fusion zone as a result of the interaction of the deposited powder and the melt pool created by the substrate material. This study also reveals the relationship between the microstructure, the average microhardness and the laser power which are comprehensively discussed. The higher the laser power, the lower the density of columnar prior beta grain structure. Also the average microhardness increases as the laser power increases.
- Full Text:
TIG welding of Ti6Al4V alloy: Microstructure, fractography, tensile and microhardness data
- Omoniyi, Peter, Mahamood, Modupe, Jen, Tien-Chien, Akinlabi, Esther
- Authors: Omoniyi, Peter , Mahamood, Modupe , Jen, Tien-Chien , Akinlabi, Esther
- Date: 2021
- Subjects: Ti6Al4V , Fractography , Microhardness
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/485953 , uj:44188 , DOI: 10.1016/j.dib.2021.107274 , Citation: Peter Omoniyi, Modupe Mahamood, Tien-Chien Jen, Esther Akinlabi, TIG welding of Ti6Al4V alloy: Microstructure, fractography, tensile and microhardness data, Data in Brief, Volume 38, 2021, https://doi.org/10.1016/j.dib.2021.107274. , ISSN: 2352-3409
- Description: Abstract: Please refer to full text to view abstract.
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- Authors: Omoniyi, Peter , Mahamood, Modupe , Jen, Tien-Chien , Akinlabi, Esther
- Date: 2021
- Subjects: Ti6Al4V , Fractography , Microhardness
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/485953 , uj:44188 , DOI: 10.1016/j.dib.2021.107274 , Citation: Peter Omoniyi, Modupe Mahamood, Tien-Chien Jen, Esther Akinlabi, TIG welding of Ti6Al4V alloy: Microstructure, fractography, tensile and microhardness data, Data in Brief, Volume 38, 2021, https://doi.org/10.1016/j.dib.2021.107274. , ISSN: 2352-3409
- Description: Abstract: Please refer to full text to view abstract.
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