Effects of annealing on laser clad Ti2SC/CrS self-lubricating anti-wear composite coatings on Ti6Al4V alloy: Microstructure and tribology

• Published in: Tribology international 2016-09, Vol.101, p.356-363
• Main Authors: Lu, Xiao-Long, Liu, Xiu-Bo, Yu, Peng-Cheng, Fu, Ge-Yan, Zhu, Gang-Xian, Wang, Yong-Guang, Chen, Yao
• Format: Article
• Language: English
• Subjects: Annealing; Laser cladding; Microstructure; Wear
• ISSN: 0301-679X; 1879-2464
• DOI: 10.1016/j.triboint.2016.05.004

Laser clad NiCr/Cr3C2 coating and Ti2SC/CrS self-lubricating anti-wear composite coating using NiCr/Cr3C2–WS2 powders were fabricated on Ti6Al4V substrates. Effects of annealing on microstructure, microhardness and tribological properties of the Ti2SC/CrS composite coatings had been investigated systematically. Results indicated that the annealing process did not have significant effects on the phase constituents and microhardness. Compared with NiCr/Cr3C2 coating, the Ti2SC/CrS coating shows good anti-wear and friction-reducing properties owing to the existence of in situ synthesized self-lubricating phases Ti2SC and CrS. Furthermore, after the appropriate annealing process (at 600°C for 1h), the anti-wear property of the Ti2SC/CrS coating could be significantly enhanced and is beneficial to the running-in surface of the counter-body. •Self-lubricating anti-wear composite coatings were fabricated on Ti6Al4V by laser cladding.•Effects of annealing on coatings have been investigated systemically.•Coating presents excellent anti-wear and friction reducing properties after annealing.