Effect of heat treatment on magnetic properties of 35CrMo steel

doi:10.13251/j.issn.0254-6051.2022.05.038

Abstract

Abstract: Based on magnetic coercive force and magnetic Barkhausen noise (MBN) nondestructive testing methods, the magnetic properties of 35CrMo steel under different heat treatment states were studied, and the surface hardness test was used as a comparative verification. The results show that compared with the original state, the grain of 35CrMo steel after quenching is refined, the coercive force increases from 10.42 A/cm to 19.85 A/cm with an increment about 90.40%, and the MBN-stress concentration is obvious. After tempering, the microstructure becomes uniform, the MBN-stress level is reduced as a whole, and the coercive force decreases to 12.50 A/cm, but the final increment is 19.96%, which is consistent with the surface hardness. The measurement of magnetic property can effectively characterize the microstructure and mechanical properties of the steel under different heat treatment conditions, and provide technical reference for online product quality test.

Key words: 35CrMo steel, coercive force, magnetic Barkhausen noise method, hardness, stress

CLC Number:

TG115

Shen Zhengxiang, Wu Caibao, Li Jinglin, Zhai Binbin, Cai Penghui, Huang Huandong, Chen Hu, Tan Jidong. Effect of heat treatment on magnetic properties of 35CrMo steel[J]. Heat Treatment of Metals, 2022, 47(5): 221-225.

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