Microstructure and wear resistance of laser clad Fe/NiCr-Cr3C2 composite coating

doi:10.13251/j.issn.0254-6051.2021.05.034

Abstract

Abstract: Fe/NiCr-Cr₃C₂ composite coating was prepared on GCr15 steel surface by laser cladding, and the effect of NiCr-Cr₃C₂ on microstructure and wear resistance of the composite coating was investigated. The results indicate that the microstructure of the composite coating refines gradually with the increase of NiCr-Cr₃C₂ content from 0 to 20%. With addition of NiCr-Cr₃C₂ into the Fe-base alloy, the residual austenite content increases in the composite coating, while the α-Fe phase content decreases, resulting in the decrease of cross-section microhardness. The composite coating added with 10% NiCr-Cr₃C₂ exhibits optimal wear resistance, and reduces the wear loss and friction resistance, which can be attributed to the formation of many hard carbide phases (Cr₃C₂ and Cr₂₃C₆) and oxide lubricating phase during wear process.

Key words: laser cladding, Fe/NiCr-Cr₃C₂ composite coating, microstructure, wear resistance

CLC Number:

TG174.44

Xia Tongchuan, Liu Ting, Zhang Lin, Fang Zhao, Li Mingxi. Microstructure and wear resistance of laser clad Fe/NiCr-Cr₃C₂ composite coating[J]. Heat Treatment of Metals, 2021, 46(5): 196-201.

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Microstructure and wear resistance of laser clad Fe/NiCr-Cr₃C₂ composite coating

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