Properties of modified layer treated by ion nitriding and laser quenching on 30CrMnSi steel

doi:10.13251/j.issn.0254-6051.2023.08.030

Abstract

Abstract: In order to obtain a surface modification process with both corrosion resistance and wear resistance, the composite treatment of ion nitriding and laser quenching of 30CrMnSi steel was researched. Firstly, the specimen was ion nitrided, and then it was quenched by using laser scanning surface. The standard test specimens were processed using the wire cutting method, the microstructure observation, hardness test, friction wear and corrosion resistance tests were carried out. The results show that after ion nitriding and laser quenching, the microstructure is cryptocrystalline martensite on the surface and gradually transforms into tempered sorbite in the core, the thickness of the composite modified layer is two times that of the ion nitrided, and the surface hardness is increased by 50 HV. The composite treatment can effectively improve the hardness and thickness of the subsurface structure, and improve the wear resistance of the material. Compared with the single ion nitrided specimen, the corrosion resistance of the composite modified layer is poorer.

Key words: ion nitriding and laser quenching composite treatment, 30CrMnSi steel, modified layer, microstructure, wear resistance

CLC Number:

TG162.79

Li Ling, Liu Xuke, Meng Qingyu, Liu Shaojun, Li Taotao, Gao Yang. Properties of modified layer treated by ion nitriding and laser quenching on 30CrMnSi steel[J]. Heat Treatment of Metals, 2023, 48(8): 185-189.

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