Grain growth behavior and magnetic property evolution of non-oriented electrical steel during annealing

doi:10.13251/j.issn.0254-6051.2022.08.020

Abstract

Abstract: Cold rolled Fe-3%Si non-oriented electrical steel sheet was annealed for different time. The grain growth behavior and magnetic properties evolution of the non-oriented electrical steel during annealing were investigated by optical microscope, EBSD and so on. The results indicate that the proportion of Goss and γ texture grains decreases with the increase of annealing time, while the proportion of {114}<841> and {001}<120> texture grains increases gradually. When the annealing time is lower than 20 s, the recrystallization texture is characterized by strong γ and Goss textures. When annealed for 60 s, the growth rate of {001}<120> texture grains increases sharply, and the average grain size reaches about 105 μm. When the annealing time is 240 s, the annealing texture is mainly strong {001}<120> and {114}<841> textures. The magnetic induction intensity along RD and TD rises rapidly during annealing for 30-60 s, and the value along RD reaches the maximum of 1.74 T at 60 s, and value along TD reaches the maximum of 1.67 T at 120 s. After that, the magnetic induction intensity decreases slightly with the increase of annealing time and stabilizes at about 1.72 T (RD) and 1.66 T (TD), respectively. The magnetic induction intensity along the 45° direction increases first and then decreases, reaching the maximum value of 1.67 T at 20 s. The iron loss along each direction decreases with the increase of annealing time, and the magnetic anisotropy also decreases gradually.

Key words: non-oriented electrical steel, annealing time, grain growth, texture, magnetic properties

CLC Number:

TG113

Guo Wenyi, Jiao Haitao, Xie Xinxiang, Zhao Longzhi, Zhao Mingjuan, Hu Yong. Grain growth behavior and magnetic property evolution of non-oriented electrical steel during annealing[J]. Heat Treatment of Metals, 2022, 47(8): 123-128.

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