Magnetic-thermal coupling to reduce residual stress and dislocation density of cold-rolled oriented silicon steel

doi:10.13251/j.issn.0254-6051.2022.11.019

Abstract

Abstract: In order to obtain an efficient process for reducing residual stress of cold-rolled oriented silicon steel, a short-time magnetic-thermal coupling treatment test scheme with low temperature and low intensity pulsed magnetic field was developed. The residual stress and dislocation density before and after the treatment were measured by X-ray residual stress meter and XRD, respectively. The results show that the short-time magnetic-thermal coupling process with low temperature and low intensity pulsed magnetic field can effectively reduce the residual stress and dislocation density of cold-rolled silicon steel. When the process is applied for 3 min at 400 ℃ and with the peak current of 180 A, the best treatment effect can be obtained, and the residual stress can be reduced by 55.5%, which is better than simply applying low temperature thermal field or low intensity pulsed magnetic field. The decrease of macro-residual stress is closely related to the dislocation density, and the change rule of the both is basically the same. The microscopic mechanism of residual stress reducing by short-time, low-temperature and low pulsed magnetic field intensity magnetic-thermal coupling treatment is that the dislocation movement in the material is further improved under the coupling action of pulsed magnetic field and temperature field, and the local recovery is realized, so as to achieve the purpose of reducing dislocation density and residual stress.

Key words: magnetic-thermal coupling, cold-rolled oriented silicon steel, residual stress, dislocation density

CLC Number:

TG156

Luo Jiahao, Chen Zhongyi, Su Pengji, Liu Baozhi, Ma Yonglin, Xing Shuqing. Magnetic-thermal coupling to reduce residual stress and dislocation density of cold-rolled oriented silicon steel[J]. Heat Treatment of Metals, 2022, 47(11): 111-116.

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