Effect of secondary annealing temperature on microstructure and magnetic properties of non-oriented silicon steel

doi:10.13251/j.issn.0254-6051.2021.03.013

Abstract

Abstract: Secondary annealing experiment of 1.2% Si non-oriented silicon steel at different temperatures were carried out, and the effect of secondary annealing temperature on the microstructure and magnetic properties of the steel was investigated. The results show that the grain size of ferrite is increased and the core loss is reduced after secondary annealing processes. The core loss of experimental steel is reduced significantly in the annealing temperature range of 780-820 ℃. In this temperature range, the magnetic properties of non-oriented silicon steel is the best, the core loss reduction is 1.0 W/kg, and the average grain size is 83-114 μm. Besides, the precipitates of the experimental steels were investigated by means of SEM. The results show that the main precipitate in the experimental steel is MnS-Cu_xS. The amount of fine MnS-Cu_xS precipitate with the size of 0.1-0.2 μm is the lowest in the annealing temperature range of 780-820 ℃.

Key words: non-oriented silicon steel, secondary annealing, magnetic properties, precipitate

CLC Number:

TG156.23

Lu Jiadong, Wu Shengjie, Yue Chongxiang, Li Hualong. Effect of secondary annealing temperature on microstructure and magnetic properties of non-oriented silicon steel[J]. Heat Treatment of Metals, 2021, 46(3): 67-70.

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