Analysis of cracks in laser clad Fe-based amorphous alloy coating

doi:10.13251/j.issn.0254-6051.2022.05.044

Abstract

Abstract: Cracks occurred when Fe-based amorphous alloy coating was cladding on the surface of 304 stainless steel substrate by using laser cladding technology. The crack forming mechanism was studied by means of qualitative analysis of the elements, hardness and precipitates around the cracks. The results show that the coating mainly contains α-Fe, α-Cr, carbides (M₇C₃, M₅C₂), silicides (CrSi₂, FeSi) and other phases. The cracks are mainly caused by the large thermal stress in the heat-affected zone and the high melting point and high hardness carbon silicide formed by the segregation of C and Si elements. The structure near the crack zone is relatively loose and there are more gaps and pores. At the same time, the combination of the hard phase is not strong, so that the hardness near the crack zone is lower than that of other defect-free areas at the same level.

Key words: laser cladding, Fe-based amorphous alloy, coating phase, crack

CLC Number:

TG174.4

Ouyang Changyao, Bai Qiaofeng, Han Binhui, Yan Xianguo. Analysis of cracks in laser clad Fe-based amorphous alloy coating[J]. Heat Treatment of Metals, 2022, 47(5): 252-256.

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