Composite process of shot peening and plasma multi-elements cycle penetrating of 40Cr steel for drill guide rail

doi:10.13251/j.issn.0254-6051.2022.07.045

Abstract

Abstract: Taking 40Cr alloy steel commonly used for guide rail of drilling rig as the research object, the strengthening mechanism of shot peening and plasma multi-elements cycle penetrating was investigated. The results show that the surface hardness of the specimen treated by the composite process is 912 HV0.2, and the infiltrated layer depth is 315 μm. It is superior to single process of plasma multi-elements cycle penetrating. Shot peening can increase the diffusion coefficient by increasing the diffusion channel and decreasing the diffusion energy. Cyclic nitriding makes the concentration gradient between the surface and the diffusion layer change periodically, which provides a driving force for the phase interface reaction and internal diffusion. The results show that the combination of shot peening and plasma multi-elements cycle penetrating has a synergistic effect, which can effectively improve the surface properties of drill guide rail.

Key words: 40Cr steel, plasma multi-elements cycle penetrating, shot peening

CLC Number:

TD713

Zhou Fujia, Liu Xiaohua. Composite process of shot peening and plasma multi-elements cycle penetrating of 40Cr steel for drill guide rail[J]. Heat Treatment of Metals, 2022, 47(7): 264-268.

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