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<p>The precipitate and texture are key factors in the crystallographic evolution, recrystallization behavior, and grain orientation distribution of the grain-oriented (GO) silicon steels. The retained precipitates and texture evolution of Bi dosage GO silicon steel during the hot rolling, normalization, cold rolling, and decarburization have been systematically studied with 0- to 25-ppm Bi content. The results show that the Bi dosage leads to the precipitation of fine AlN and the possible formation of (Bi-MnS)s, with a Bi-MnS pre-composite structure potentially forming. The precipitate size in the 12-ppm sample is the smallest, and the thermal stability is high. The {114}&lt;841&gt; grains rotate around the ND axis to form a nearly {110} crystal nucleus, which is then consumed by Goss grains and undergoes selective abnormal growth. The γ fiber texture, (ND//&lt;111&gt;), is prone to undergo geometric softening during the cold rolling, resulting in concentrated local plastic deformation and the formation of high-density shear bands, which have high stored energy and significant lattice distortion, providing preferred nucleation sites for Goss grains. Finally, the magnetic induction B<sub>8</sub> is achieved at 1.78&#xa0;T, and the iron loss is 1.31&#xa0;W/kg. There results provide guidance for achieving dual control between precipitation pinning and texture evolution with the Bi dosage.</p>

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Dual Control of Retained Precipitates and Texture Evolution by Bi Dosage in Grain-Oriented Silicon Steel

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Di Zhang,
  • Lan Wei,
  • Jutao Liu,
  • Shufeng Yang,
  • Huilan Sun,
  • Bo Wang

摘要

The precipitate and texture are key factors in the crystallographic evolution, recrystallization behavior, and grain orientation distribution of the grain-oriented (GO) silicon steels. The retained precipitates and texture evolution of Bi dosage GO silicon steel during the hot rolling, normalization, cold rolling, and decarburization have been systematically studied with 0- to 25-ppm Bi content. The results show that the Bi dosage leads to the precipitation of fine AlN and the possible formation of (Bi-MnS)s, with a Bi-MnS pre-composite structure potentially forming. The precipitate size in the 12-ppm sample is the smallest, and the thermal stability is high. The {114}<841> grains rotate around the ND axis to form a nearly {110} crystal nucleus, which is then consumed by Goss grains and undergoes selective abnormal growth. The γ fiber texture, (ND//<111>), is prone to undergo geometric softening during the cold rolling, resulting in concentrated local plastic deformation and the formation of high-density shear bands, which have high stored energy and significant lattice distortion, providing preferred nucleation sites for Goss grains. Finally, the magnetic induction B8 is achieved at 1.78 T, and the iron loss is 1.31 W/kg. There results provide guidance for achieving dual control between precipitation pinning and texture evolution with the Bi dosage.