Effect of multi-pass electron beam scanning overlap rate  on microstructure and properties of 40Cr steel

doi:10.13251/j.issn.0254-6051.2022.03.036

Abstract

Abstract: Multi-pass electron beam scanning surface modification was carried out on 40Cr steel with different overlap rates, and microstructure and properties was studied. The results show that after multi-pass electron beam scanning surface modification, tempered martensite and tempered sorbite are formed in the overlapping area of 40Cr steel due to tempering, and the martensite structure in the remelted layer becomes coarsen with the increase of overlap rate. When the overlap rate is 0%, the average microhardness of the electron beam treatment area is 627.4 HV0.2, with the increase of overlap rate, the microhardness of overlap area decreases. When the overlap rate is 25%, the surface of the specimen is smooth and flat, and the roughness is 1.083 μm. The surface roughness first decreases and then increases with the increase of overlap rate. In addition, the wear resistance of the 40Cr steel is significantly improved compared with that before electron beam treatment. The wear resistance first increases and then decreases with the increase of overlap rate.

Key words: 40Cr steel, electron beam scanning treatment, overlap rate, microstructure, hardness, wear resistance

CLC Number:

TG439.3

Wang Rong, Gong Yuhui, Yin Xuejun, Wei Deqiang. Effect of multi-pass electron beam scanning overlap rate on microstructure and properties of 40Cr steel[J]. Heat Treatment of Metals, 2022, 47(3): 191-197.

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Effect of multi-pass electron beam scanning overlap rate on microstructure and properties of 40Cr steel

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