Effect of annealing process on magnetic properties of flattening rolled 50W800 non-oriented silicon steel

doi:10.13251/j.issn.0254-6051.2022.11.020

Abstract

Abstract: In order to improve the sheet shape of the 50W800 non-oriented silicon steel, the silicon steel after recrystallization annealing needs to be flattened, but the magnetic properties of the silicon steel sheet will decrease after flattening. The stress relief annealing test of the flattening rolled 50W800 non-oriented silicon steel was designed at 400-800 ℃, the iron loss and magnetic induction strength were measured by a single chip measuring method and the microstructure and texture were analyzed by EBSD technology. The results show that the small angle grain boundary of the 50W800 non-oriented silicon steel increases after flattening, but the nonuniformity of grain leads to the decrease of magnetic properties. It is found that after stress relief annealing at 700 ℃ for 2 min, the magnetic properties of 50W800 non-oriented silicon steel are improved. EBSD technology analysis shows that the stress relief annealing can consume a large amount of small angle grain boundary, reduce the grain boundary content, increase the grain uniformity, and reduce the strength of unfavorable deformation texture {111} <112>, which is the main reason for the improvement of magnetic properties of the 50W800 non-oriented silicon steel.

Key words: non-oriented silicon steel, small angle grain boundary, flattening and annealing, magnetic properties

CLC Number:

TG335.21

Qiao Degao, Zhao Xiaolong, Di Yanjun, Guo Yuanqiang, Lin Xiaoliang. Effect of annealing process on magnetic properties of flattening rolled 50W800 non-oriented silicon steel[J]. Heat Treatment of Metals, 2022, 47(11): 117-121.

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