Effect of overlap rate on microstructure and properties of Ni60A clad coating on TC4 titanium alloy

doi:10.13251/j.issn.0254-6051.2021.09.041

Abstract

Abstract: Multi-pass Ni60A laser clad coating was prepared on the surface of TC4 titanium alloy by using laser cladding coaxial powder feeding technology. The microstructure and properties of the clad coating with overlap rates (30%, 40%, 50%, 60% and 70%) were analyzed by using SEM, hardness test, and friction and wear test. The results show that the overlap rate has a greater impact on the microstructure and properties of the clad coating, which can realize the secondary heating of the coating. When the overlap rate is 50%, the size of hard phase TiC and the content of TiNi in the coating increase, which can effectively improve the hardness of the coating, resist the shear force on the grinding ball, so that the surface is not easy to be damaged, and the surface of the coating is smooth, which can greatly reduce the friction coefficient. When the overlap rate is 30%, the grains can't fully absorb the laser energy, resulting in smaller grain size. But when the overlap rate is too high, the B, C, Ni and other elements in the coating will be diluted with the over burning, resulting in the loss of reinforcing elements in the coating and reducing the mechanical properties of the coating. Therefore, the most suitable overlap rate of the Ni60A coating is 50%.

Key words: laser cladding, Ni60A clad coating, overlap rate, microstructure, wear resistance, hardness

CLC Number:

TG174.4

Gong Yuling, Wu Meiping, Cui Chen, Miao Xiaojin. Effect of overlap rate on microstructure and properties of Ni60A clad coating on TC4 titanium alloy[J]. Heat Treatment of Metals, 2021, 46(9): 229-233.

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