Microstructure and tribological properties of laser in-situ synthesized Ti3Al composite coating on Ti-6Al-4V
Microstructure and tribological properties of laser in-situ synthesized Ti3Al composite coating on Ti-6Al-4V
Titanium intermetallics are highly significant to protect surfaces of lightweight structures against corrosion and wear. In this study, Ti and Al powders were uniformly mixed with an atomic ratio 65:35 and in-situ synthesized on Ti-6Al-4V substrate by laser cladding with Ar cooling. The microstructure and high temperature tribological behavior were studied. The results show that Ti3Al (α2) phase was first precipitated in the form of coarse primary dendrites during cladding solidification, and subsequently α-Ti (α) phase of needle-shaped martensite was formed by fast cooling. The 6:4 ratio of phase α2 to α of the composite coating provides optimal toughness and high hardness (680 HV). Under the testing up to 500 °C, the average friction coefficient of the composite coating is 0.22 ± 0.011 and a 35% lower wear rate than that of Ti-6Al-4V substrate.
Friction and Wear, Laser cladding, Microstructure, Ti3Al composite coating
Zhang, Wenbin
9936b8d7-caa5-4826-a0e1-b47d687245ec
Li, Wensheng
9483fd8e-f3d4-48b8-8a75-14ff5fc5d9e5
Zhai, Haimin
9831578f-7ef7-42ea-b540-f3543537e7fd
Wu, Yanrong
3b01c48f-2f31-4833-88c4-664aede42600
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Liang, Gang
0e3c4750-8136-4804-a4dd-3530d6eee46c
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
15 August 2020
Zhang, Wenbin
9936b8d7-caa5-4826-a0e1-b47d687245ec
Li, Wensheng
9483fd8e-f3d4-48b8-8a75-14ff5fc5d9e5
Zhai, Haimin
9831578f-7ef7-42ea-b540-f3543537e7fd
Wu, Yanrong
3b01c48f-2f31-4833-88c4-664aede42600
Wang, Shuncai
8a390e2d-6552-4c7c-a88f-25bf9d6986a6
Liang, Gang
0e3c4750-8136-4804-a4dd-3530d6eee46c
Wood, Robert
d9523d31-41a8-459a-8831-70e29ffe8a73
Zhang, Wenbin, Li, Wensheng, Zhai, Haimin, Wu, Yanrong, Wang, Shuncai, Liang, Gang and Wood, Robert
(2020)
Microstructure and tribological properties of laser in-situ synthesized Ti3Al composite coating on Ti-6Al-4V.
Surface and Coatings Technology, 395, [125944].
(doi:10.1016/j.surfcoat.2020.125944).
Abstract
Titanium intermetallics are highly significant to protect surfaces of lightweight structures against corrosion and wear. In this study, Ti and Al powders were uniformly mixed with an atomic ratio 65:35 and in-situ synthesized on Ti-6Al-4V substrate by laser cladding with Ar cooling. The microstructure and high temperature tribological behavior were studied. The results show that Ti3Al (α2) phase was first precipitated in the form of coarse primary dendrites during cladding solidification, and subsequently α-Ti (α) phase of needle-shaped martensite was formed by fast cooling. The 6:4 ratio of phase α2 to α of the composite coating provides optimal toughness and high hardness (680 HV). Under the testing up to 500 °C, the average friction coefficient of the composite coating is 0.22 ± 0.011 and a 35% lower wear rate than that of Ti-6Al-4V substrate.
Text
Microstructure and tribological properties
- Accepted Manuscript
More information
Accepted/In Press date: 18 May 2020
e-pub ahead of print date: 19 May 2020
Published date: 15 August 2020
Additional Information:
Funding Information:
The authors would like to acknowledge the support of National Natural Science Foundation of China (No. 51674130 ), International Science and Technology Cooperation Programme of China ( 2015DFR51090 ), the National High-end Foreign Experts Program of China ( GDT20186200331 ), the International Science and Technology Correspondent Program of Gansu Province ( 17JR7WA017 ), and the program of “ Science and Technology International Cooperation Demonstrative Base of Metal Surface Engineering along the Silk Road ”.
Publisher Copyright:
© 2020 Elsevier B.V.
Keywords:
Friction and Wear, Laser cladding, Microstructure, Ti3Al composite coating
Identifiers
Local EPrints ID: 441128
URI: http://eprints.soton.ac.uk/id/eprint/441128
ISSN: 0257-8972
PURE UUID: 0c68a2e0-164a-4b01-b8a2-47743eb1db4e
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Date deposited: 02 Jun 2020 16:30
Last modified: 17 Mar 2024 05:35
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Contributors
Author:
Wenbin Zhang
Author:
Wensheng Li
Author:
Haimin Zhai
Author:
Yanrong Wu
Author:
Gang Liang
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