304不锈钢表面激光熔覆NiMoSi层的组织与性能

doi:10.13251/j.issn.0254-6051.2020.03.007

摘要/Abstract

摘要：

为改善304不锈钢的摩擦学性能,分别以A熔覆层20%Ni-48%Mo-32%Si,B熔覆层30%Ni-42%Mo-28%Si(质量分数)混合粉末为原料,在304不锈钢表面利用激光熔覆技术制备复合熔覆层,分别利用XRD、SEM和摩擦磨损试验机分析了熔覆层的物相、显微组织结构及室温下的摩擦学性能。结果表明:复合熔覆层和基体冶金结合良好,仅存在部分裂纹。Mo₅Si₃、MoSi₂是复合熔覆层的主要物相,A熔覆层显微硬度(1060.1 HV0.5)和B熔覆层显微硬度(725.9 HV0.5)均明显高于基体(257.2 HV0.5),A复合熔覆层的磨损率和摩擦因数最低。

关键词: 激光熔覆, NiMoSi复合熔覆层, 304不锈钢, 摩擦学性能

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

中图分类号:

TG174.44

刘东华, 周康宁, 周劲松, 张彬娟, 谌磊, 柯金, 刘秀波. 304不锈钢表面激光熔覆NiMoSi层的组织与性能[J]. 金属热处理, 2020, 45(3): 30-34.

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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