Effect of normalizing process on microstructure and magnetic properties of grain-oriented silicon steel

doi:10.13251/j.issn.0254-6051.2024.03.009

Abstract

Abstract: Effect of normalizing temperature on the microstructure, texture and magnetic properties of 3.2wt%Si high magnetic induction orientation (Hi-B) silicon steel was studied by means of EBSD technique and single-chip measurement method. The results show that with the increase of normalizing temperature, the columnar grains of the normalized plate are completely recrystallized, and the texture types are similar to α texture, λ texture and Goss texture. After decarburizing annealing, the texture mainly consists of {114}<481>, γ texture and Goss texture, and the primary recrystallized grain size increases first and then decreases with the increase of normalizing temperature (maximum at 900 ℃ , up to 20.3 μm). After normalizing annealing at 850 ℃, the area fractions of {114}<481> texture and Goss texture, which are beneficial to magnetic properties, reach the highest (26.1% and 4.5%, respectively) in the primary recrystallized specimen. When the normalizing temperature is 850 ℃, the Hi-B steel can obtain the best magnetic properties, B₈=1.938 T, P_1.7/50= 0.828 W/kg.

Key words: grain-oriented silicon steel, normalizing temperature, microstructure, texture, magnetic properties

CLC Number:

TG142.77

You Wenhao, Chen Xia, Chen Bin. Effect of normalizing process on microstructure and magnetic properties of grain-oriented silicon steel[J]. Heat Treatment of Metals, 2024, 49(3): 50-55.

References

[1]何忠治. 电工钢的现状与展望[J]. 中国冶金, 2001, 11(4): 14-16.
He Zhongzhi. Present situation and prospect for electrical steel[J]. China Metallurgy, 2001, 11(4): 14-16.
[2]高洁, 何承绪, 杨富尧, 等. 超薄取向硅钢研究进展及发展方向[J]. 金属热处理, 2019, 44(8): 59-63.
Gao Jie, He Chengxu, Yang Fuyao, et al. Research progress and development direction of ultra-thin grain-oriented silicon steel[J]. Heat Treatment of Metals, 2019, 44(8): 59-63.
[3]李志超, 唐荻, 党宁, 等. 2000年以来取向硅钢的研究进展[J]. 金属热处理, 2012, 37(3): 5-9.
Li Zhichao, Tang Di, Dang Ning, et al. Research advance of the grain oriented silicon steel since 2000[J]. Heat Treatment of Metals, 2012, 37(3): 5-9.
[4]程灵, 杨富尧, 马光, 等. 电力变压器用高磁感取向硅钢的发展及应用[J]. 材料导报, 2014, 28(11): 115-118.
Cheng Ling, Yang Fuyao, Ma Guang, et al. Development and application of high magnetic induction grain-oriented silicon steel for power transformer[J]. Materials Review, 2014, 28(11): 115-118.
[5]Wang Y, Xu Y B, Zhang Y X, et al. Effect of annealing after strip casting on texture development in grain oriented silicon steel produced by twin roll casting[J]. Materials Characterization, 2015, 107: 79-84.
[6]Chang S K. Texture change from primary to secondary recrystallization by hot-band normalizing in grain-oriented silicon steels[J]. Materials Science and Engineering A, 2007, 452-453: 93-98.
[7]Li H, Feng Y L, Song M, et al. Effect of normalizing cooling process on microstructure and precipitates in low-temperature silicon steel[J]. Transactions of Nonferrous Metals Society of China, 2014, 24(3): 770-776.
[8]Hu C, Song R, Wang Y, et al. Comprehensive influence of the normalized and final annealing process on high-strength nonoriented silicon steel[J]. Steel Research International, 2022, 93(7): 2100641.
[9]卢晓禹, 董磊, 黄利, 等. 高磁感取向硅钢27QG090的常化退火工艺[J]. 金属热处理, 2023, 48(1): 186-189.
Lu Xiaoyu, Dong Lei, Huang Li, et al.Normalizing annealing process of 27QG090 high magnetic induction oriented silicon steel[J]. Heat Treatment of Metals, 2023, 48(1): 186-189.
[10]谯德高, 赵小龙, 狄彦军, 等. 退火工艺对平整轧制后50W800无取向硅钢磁性能的影响[J]. 金属热处理, 2022, 47(11): 117-121.
Qiao Degao, Zhao Xiaolong, Di Yanjun, et al. 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.
[11]Gutiérrez C E J, Hernández M M G, Salinas R A, et al. An EBSD investigation on the columnar grain growth in non-oriented electrical steels assisted by strain induced boundary migration[J]. Materials Letters, 2019, 252: 42-46.
[12]Li Z H, Xie S K, Wang G D, et al. Dependence of recrystallization behavior and magnetic properties on grain size prior to cold rolling in high silicon non-oriented electrical steel[J]. Journal of Alloys and Compounds, 2021, 888: 161576.
[13]Wang X, Luo L, Li W. Origin of fine equiaxed grains in industrial low-temperature grain-oriented silicon steel normalized sheet and their influence on magnetic properties[J]. Journal of Magnetism and Magnetic Materials, 2022, 552: 169210.
[14]Fang F, Yang J, Zhang Y, et al. Microstructure and magnetic properties of ultra-thin grain-oriented silicon steel: Conventional process versus strip casting[J]. Journal of Magnetism and Magnetic Materials, 2021, 535: 168087.
[15]Giorgio Bertotti. General properties of power losses in soft ferromagnetic materials[J]. IEEE Transactions on Magnetics, 1988, 24(1): 621-630.
[16]Shiozaki M, Kurosaki Y. The effects of grain size on the magnetic properties of nonoriented electrical steel sheets[J]. Journal of Materials Engineering, 1989, 11(1): 37-43.
[17]苏志贺, 金自力, 吴忠旺, 等. 罩式退火工艺的升温速率对无取向硅钢织构及性能的影响[J]. 金属热处理, 2022, 47(10): 124-128.
Su Zhihe, Jin Zili, Wu Zhongwang, et al. Influence of heating rate of bell annealing process on texture and properties of non-oriented silicon steel[J]. Heat Treatment of Metals, 2022, 47(10): 124-128.