Effect of heat treatment on microstructure and properties of stainless steel coating by high-speed laser cladding

doi:10.13251/j.issn.0254-6051.2023.02.043

Abstract

Abstract: Stainless steel coating was prepared on the surface of 27SiMn steel by high-speed laser cladding technology, and the coating was subsequently heat treated. The morphology and microstructure of the coating before and after heat treatment were characterized, and the microhardness, frictional wear properties, impact property and corrosion resistance of the specimens were tested and analyzed. The results show that the coating are mainly composed of α-(Fe,Cr), carbides such as M₇C₃, M₂₃C₆, and Cr₃Si reinforced phases. For the coating after heat treatment, the grains of the coating are significantly refined and distributed more uniformly; the hardness is not significantly higher than that without heat treatment, but the hardness distribution is smoother, and the average hardness reaches 446 HV0.2; the wear rate decreases by 1.7×10^-5 mm³·(N·m)^-¹, the impact property increases by 28.6%, and the self corrosion current density is only 9.19% of that before heat treatment.

Key words: high-speed laser cladding, stainless steel, heat treatment, microstructure, mechanical properties, corrosion resistance

CLC Number:

Weng Yiqing, Xue Ruilei, Man Jiao, Gao Feng, Zhou Jianping, Chen Yanhua, Han Yonghong. Effect of heat treatment on microstructure and properties of stainless steel coating by high-speed laser cladding[J]. Heat Treatment of Metals, 2023, 48(2): 276-283.

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