Microstructure and mechanical properties of in-situ MC-reinforced CoCrMoNbTi high-entropy alloy coating by laser additive manufacturing

Longjun He; Mina Zhang; Xuyang Ye; Zifa Xu; Wenwu Zhang; Dianbo Ruan

doi:10.1117/12.2603053

31 August 2021 Microstructure and mechanical properties of in-situ MC-reinforced CoCrMoNbTi high-entropy alloy coating by laser additive manufacturing

Longjun He, Mina Zhang, Xuyang Ye, Zifa Xu, Wenwu Zhang, Dianbo Ruan

Author Affiliations +

Proceedings Volume 11907, Sixteenth National Conference on Laser Technology and Optoelectronics; 119071U (2021) https://doi.org/10.1117/12.2603053
Event: Sixteenth National Conference on Laser Technology and Optoelectronics, 2021, Shanghai, China

Abstract

In situ carbides (TiC/Cr₇C₃) reinforced CoCrMoNbTiC_0.2 high-entropy alloy coatings were prepared on the Ti-6Al- 4V titanium alloy substrate by laser melting deposition technology. Effect of the laser power on the surface morphology, phase consistent, microstructure and microhardness were investigated. The results show that the coatings were composed of a simple BCC solid solution and a small amount of TiC and Cr₇C₃carbides. The in-situ MC (TiC/Cr₇C₃) carbides were evenly distributed in the BCC matrix. The laser power has a significant impact on the forming quality and mechanical properties of the coatings. As the optimal laser power of 1500 W were applied, the coating mostly free of defects exhibited a fine dendritic microstructure. With the increasing laser power, the microhardness of the coatings was first increased and then decreased gradually. The highest microhardness of the coating (1500 W) was up to 650 HV0.5, which was 2 times higher than that of the substrate. The excellent mechanical properties of the coatings were attributed to the synergetic effects of the second phase strengthening, solid solution strengthening and fine microstructure.

Citation Download Citation

Longjun He, Mina Zhang, Xuyang Ye, Zifa Xu, Wenwu Zhang, and Dianbo Ruan "Microstructure and mechanical properties of in-situ MC-reinforced CoCrMoNbTi high-entropy alloy coating by laser additive manufacturing", Proc. SPIE 11907, Sixteenth National Conference on Laser Technology and Optoelectronics, 119071U (31 August 2021); https://doi.org/10.1117/12.2603053

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