Microstructure Evolution of Fe-3.5%Si Non-oriented Silicon Steel Prepared by Double Cold Rolling

WANG Yi'nan; LU Huihu; LIN Yuan; GU Xiangyu; QIAO Weidong; YANG Shengchao; QI Chengzhe; LI Zeyang

doi:10.3969/j.issn.1674-6457.2025.07.012

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (7) : 102-109. DOI: 10.3969/j.issn.1674-6457.2025.07.012

Iron and Steel Forming

Microstructure Evolution of Fe-3.5%Si Non-oriented Silicon Steel Prepared by Double Cold Rolling

WANG Yi'nan¹, LU Huihu^1,*, LIN Yuan², GU Xiangyu², QIAO Weidong¹, YANG Shengchao¹, QI Chengzhe¹, LI Zeyang¹

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Abstract

The work aims to take the 3.5wt.% Si non-oriented silicon steel as the research object and investigate the evolution of microstructure and texture of the 0.25 mm thick non-oriented silicon steel by double cold rolling. The microstructure and properties of the non-oriented silicon steel during preparation were studied through cold rolling, heat treatment, EBSD and tensile test at room temperature. The surface layer of the hot rolled plate was partially recrystallized and consisted of shear bands, recovery structures and fine equiaxed crystals, and there were a lot of shear bands and deformation bands in the center layer. The surface layer was mainly composed of Goss texture, and the central layer was composed of Fan-sharp α fiber texture. Complete recrystallization occurred after normalization at 950 ℃×3 min, and the average grain size was (147.6±1.9) μm. α fiber texture was transformed into α* fiber texture. The α-fiber texture and γ-fiber texture of the first cold rolled plate were completely recrystallized after annealing at 950 ℃×3 min. The average grain size was (119.3±6.9) μm. In the secondary cold rolled plate, there were sharp $\{001\}\langle 1 \overline{1} 0\rangle$ texture and γ-fiber texture. After recrystallization and annealing at 960 ℃×3 min, the average grain size was (145.4±4.4) μm. The texture groups were divided into cubic, rotating cubic and Goss textures. The yield strength and elongation after annealing were 515.6 MPa and 11.6%. The high-strength non-oriented silicon steel was obtained by double cold rolling. The strengthening mechanism of yield strength is mainly solid solution strengthening, and the contribution value is 357.63 MPa, accounting for 67.63%. The magnetic inductance B₅₀₀₀ of the final annealed sample is 1.690 T and the iron loss P_1.0/400 is 13.37 W/kg.

Key words

non-oriented silicon steel / double cold rolling / annealing temperature / micro-texture / mechanical property

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WANG Yi'nan, LU Huihu, LIN Yuan, GU Xiangyu, QIAO Weidong, YANG Shengchao, QI Chengzhe, LI Zeyang. Microstructure Evolution of Fe-3.5%Si Non-oriented Silicon Steel Prepared by Double Cold Rolling[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 102-109 https://doi.org/10.3969/j.issn.1674-6457.2025.07.012

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