Investigation on Microstructure and Performance of Wear-resistant and Impact-resistant Composite Coating Produced by Laser Cladding

doi:10.3901/JME.2021.12.237

Abstract

Abstract: In order to improve the wear and impact resistance of the large driving wheel gear ring, the ZG42CrMoA was used in gear ring as the object of study. The 5 kW CO₂ laser, four-axis CNC machines and the coaxial powder feeding system were used to produce the sandwich and homogeneous composite coating by laser cladding on the surface of ZG42CrMoA. The microstructure was characterized by using optical microscopy, SEM, XRD and microhardness tester. The friction and wear tester and charpy impact tester were used to test the wear rate and impact toughness of high frequency induction hardened ZG42CrMoA, sandwich and homogeneous composite coating. The results show that the homogeneous composite coating has a uniform structure and contains γ-Ni, Ni₃B, M₂₃C₆, WC and W₂C phases. The interlayer contains γ-Ni, M₂₃C₆, NiMo and NiMo₄ phases. Microstructure of interlayer mainly includes equiaxed crystals. The segregation of Mo prevents the precipitation of Cr. The wear rate of the sandwich and homogeneous composite coating are 64.71% and 56.84% lower than that of the substrate and the high-frequency quenched sample. The impact toughness of the sandwich composite coating are 8.21% and 14.67% higher than that of the homogeneous composite coating and the high-frequency quenched sample, and reaches 65.37% of the substrate. Numerical simulation shows that the interlayer can more effectively relieve the stress concentration of the composite coating. The above shows that the interlayer can effectively improve the impact resistance of the composite coating.

Key words: laser cladding, ZG42CrMoA, composite coating, microstructure, wear resistance, impact resistance

CLC Number:

TG174

LI Yunfeng, SHI Yan. Investigation on Microstructure and Performance of Wear-resistant and Impact-resistant Composite Coating Produced by Laser Cladding[J]. Journal of Mechanical Engineering, 2021, 57(12): 237-246.

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