Significant effect of as-cast microstructure on texture evolution and magnetic properties of strip cast non-oriented silicon steel

Haitao Jiao¹，Yunbo Xu¹，Wenzheng Qiu¹，Haijie Xu¹，R.D.K.Misra²，Jianping Li¹，Guodong Wang¹

1. State Key Laboratory of Rolling and Automation,Northeastern University2. Laboratory for Excellence in Advanced steel Research,Department of Metallurgical,Materials,and Biomedical Engineering,University of Texas at El Paso

摘 要：In this study, two types of as-cast microstructure produced by strip casting were cold rolled and annealed to investigate the effect of initial microstructure on the textural evolution and magnetic properties of non-oriented silicon steel. The results indicated that the cold-rolled sheets of coarse-grained strip with pronounced {100} components exhibited stronger 入 fiber（<100>//ND） and weaker γ fiber（<111>//ND）texture as composed to the fine-grained strip with strong Goss（{110}（001）） texture. After annealing, the former was dominated by η fiber（<001>//RD） texture with a peak at {110}<001)orientation, while the latter consisted of strong {111}（112） and relatively weak {110}（001） texture. In addition, a number of precipitates of size ～30-150 nm restricted the grain growth during annealing, resulting in recrystallization of grain size of ～46 μm in the coarse-grained specimen and ～41μm in the fine-grained specimen.Ultimately, higher magnetic induction（～1.72 T） and lower core loss（～4.04 W/kg） were obtained in the final annealed sheets of coarse-grained strip with strong {100} texture.

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