Effect of annealing temperature on microstructure, texture and magnetic properties of oriented silicon steel

doi:10.13251/j.issn.0254-6051.2024.11.021

Abstract

Abstract: Effect of annealing temperature on microstructure, texture and magnetic properties of Fe-3.2%Si oriented silicon steel in rolling direction and transverse direction was studied. The results show that when the annealing temperature is 850-1025 ℃, the specimen does not undergo secondary recrystallization, and the main textures are α^* texture and γ texture. When the annealing temperature rises to 1025-1050 ℃, the secondary recrystallization takes place preferentially near the surface of the specimen in the rolling direction and transverse direction, and the grain grows abnormally rapidly with the increase of annealing temperature. At 1050-1100 ℃, the whole specimen is fully secondary recrystallized, forming a single Goss texture. When the annealing temperature is 850-1025 ℃, the corresponding magnetic inductances B₈ and P_15/50 have no obvious changes, but the magnetic properties are obviously improved when the temperature is raised to 1050 ℃, and when kept at 1050 ℃ for 1 h, the magnetic properties are the best, with B₈ of 1.92 T along the rolling direction, P_15/50 of 1.40 W/kg, relative permeability of 1.17×10⁴ and coercivity of 36.70 A/m. In the transverse direction, B₈ is 1.35 T, P_15/50 is 3.50 W/kg, and the relative permeability and coercivity are 531.75 and 77.51 A/m, respectively.

Key words: oriented silicon steel, annealing, microstructure, texture, magnetic properties

CLC Number:

TG156.2

Song Kunfeng, Wu Jun, Tang Chaoping, Zhu Shitong, Jia Juan, Song Xinli, Zhu Bolin. Effect of annealing temperature on microstructure, texture and magnetic properties of oriented silicon steel[J]. Heat Treatment of Metals, 2024, 49(11): 143-148.

References

[1]周顺兵, 吴立新, 韩荣东, 等. 大晶粒取向硅钢磁性与晶粒取向偏离角的关系研究[J]. 电工材料, 2015(5): 14-17.
Zhou Shunbing, Wu Lixin, Han Rongdong, et al. Research on relationship between magnetic property and orientation deflection angle of oriented silicon steels with large grains[J]. Electrical Engineering Materials, 2015(5): 14-17.
[2]张文辉, 王若平, 毛炯辉, 等. HiB钢与低温高磁感取向硅钢性能比较[J]. 金属热处理, 2012, 37(3): 10-13.
Zhang Wenhui, Wang Ruoping, Mao Jionghui, et al. Property comparison of HiB steel and low temperature high permeability silicon steel[J]. Heat Treatment of Metals, 2012, 37(3): 10-13.
[3]Alyozbaky O S, Ab-Kadir M Z A, Izadi M, et al. A new approach of core structure model for 3-phase distribution transformer[J]. International Transactions on Electrical Energy Systems, 2018, 28(8): e2572.
[4]Jones M A, Moses A J. Comparison of the localized power loss and flux distribution in the butt and lap and mitred overlap corner configurations[J]. IEEE Transactions on Magnetics, 1974, 10(2): 321-326.
[5]Davies D, Moses A J. A novel method of reducing iron losses in power transformer cores[J]. IEEE Transactions on Magnetics, 2003, 20(4): 559-563.
[6]Marketos P, Meydan T, Snell D. Performance of single-phase transformer cores assembled from consolidated stacks of electrical steels[J]. Journal of Magnetism and Magnetic Materials, 2003, 254: 612-614.
[7]Johannesen S E. Electrical induction apparatus: US Pat 1698634[P]. 1929-01-08.
[8]Liu X, Yang Y, Yang F. Numerical research on the losses characteristic and hot-spot temperature of laminated core joints in transformer[J]. Applied Thermal Engineering, 2017, 110: 49-61.
[9]Wang W, Nysveen A, Magnusson N. The influence of multidirectional leakage flux on transformer core losses[J]. Journal of Magnetism and Magnetic Materials, 2021, 539: 168370.
[10]Appino C, Ferrara E, Fiorillo F, et al. Static and dynamic energy losses along different directions in GO steel sheets[J]. Journal of Magnetism and Magnetic Materials, 2020, 500: 166281.
[11]Rajmohan N, Szpunar J A. An analytical method for characterizing grain boundaries around growing goss grains during secondary recrystallization[J]. Scripta Materialia, 2001, 44(10): 2387-2392.
[12]Kumano T, Ushigami Y. Grain boundary characteristics of isolated grains in conventional grain oriented silicon steel[J]. ISIJ International, 2007, 47(6): 890-897.
[13]唐超平, 吴隽, 詹东方, 等. 一次再结晶取向硅钢中第二相粒子局部密度与晶界的关系[J]. 材料热处理学报, 2018, 39(6): 76-82.
Tang Chaoping, Wu Jun, Zhan Dongfang, et al. Relationship between local densities of second-phase particles and corresponding grain boundary in primary recrystallized grain-oriented silicon steel[J]. Transactions of Materials and Heat Treatment, 2018, 39(6): 76-82.
[14]杨平, 李志超, 毛卫民, 等. 钢中{111}<112>再结晶织构的形成[J]. 材料热处理学报, 2009, 30(3): 46-52.
Yang Ping, Li Zhichao, Mao Weimin, et al. Formation of the {111}<112> annealing texture in steels[J]. Transactions of Materials and Heat Treatment, 2009, 30(3): 46-52.
[15]Yoshitomi Y, Ushigami Y, Harase J, et al. Coincidence grain boundary and role of primary recrystallized grain growth on secondary recrystallization texture evolution in Fe-3%Si alloy[J]. Acta Metallurgica, 1994, 42(8): 2593-2602.
[16]Qin J, Yang P, Mao W, et al. Effect of texture and grain size on the magnetic flux density and core loss of cold-rolled high silicon steel sheets[J]. Journal of Magnetism and Magnetic Materials, 2015, 393: 537-543.
[17]何志坚, 施立发, 裴英豪, 等. 退火温度对2.5%Si硅钢组织及磁性能的影响[J]. 电工钢, 2019, 1(1): 42-47.
He Zhijian, Shi Lifa, Pei Yinghao, et al. Effect of annealing temperature on micro-structure and magnetic properties of non-oriented silicon steel containing 2.5%Si[J]. Electrical Steel, 2019, 1(1): 42-47.
[18]Jiao H T, Qiu W Z, Xiong W, et al. Effect of recrystallization annealing temperature on microstructure, texture and magnetic properties of non-oriented silicon steel produced by strip casting[J]. Procedia Engineering, 2017, 207: 2078-2082.
[19]毕娜, 张宁, 杨平. 取向硅钢薄带形变再结晶组织及织构演变[J]. 工程科学学报, 2015, 37(1): 50-56.
Bi Na, Zhang Ning, Yang Ping. Deformation and recrystallization texture and microstructure evolution of thin grain-oriented silicon steel sheets[J]. Chinese Journal of Engineering, 2015, 37(1): 50-56.