Microstructure and properties of NiMoSi laser clad layer on surface of 304 stainless steel

doi:10.13251/j.issn.0254-6051.2020.03.007

Abstract

Abstract:

In order to improve the tribological properties of 304 stainless steel, two coatings with different composition were prepared on the surface of 304 stainless steel by laser cladding, in which coating A was 20%Ni-48%Mo-32%Si and coating B was 30%Ni-42%Mo-28%Si (mass fraction). The phase composition, microstructure, and tribological properties at room temperature were analyzed by means of XRD, SEM and friction abrasion testing machine. The results show that both coatings have good metallurgical bonding with the matrix, but with some cracks. Both composite coating A and B mainly consist of Mo₅Si₃ and MoSi₂, the microhardness of the coating A (1060.1 HV0.5) and coating B(725.9 HV0.5) is obviously higher than that of the matrix (257.2 HV0.5). The wear rate and friction coefficient of the layer A is lowest.

Key words: laser cladding, NiMoSi composite coatings, 304 stainless steel, tribological properties

CLC Number:

TG174.44

Liu Donghua, Zhou Kangning, Zhou Jinsong, Zhang Binjuan, Chen Lei, Ke Jin, Liu Xiubo. Microstructure and properties of NiMoSi laser clad layer on surface of 304 stainless steel[J]. HTM, 2020, 45(3): 30-34.

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