关键词: 无取向硅钢；冷轧压下率；显微组织；织构

Abstract: The influence of cold rolling reduction rate on the micro-structure and texture of non-oriented silicon steel with 3.3%Si was studied in this paper. The results show that: the cold-rolled sheet micro-structures under different cold rolling reduction rates all contain a large number of shear band structures and strip-like fiber structures along the rolling direction. The texture is mainly composed of a strong α fiber texture dominated by the rotated cube texture {001}〈100〉 and a very weak γ fiber texture. As the cold rolling reduction rate increases from 84.6% to 88.6%, the shear band structures in the cold-rolled sheet gradually disappear, and the broken and elongated grains gradually form more and more strip-like fiber structures along the rolling direction. The texture continuously changes from the main orientation {110}〈110〉 of the shear band structures to the main orientations {111}〈110〉 and {112}〈111〉 of the strip-like fiber structures. In the finished annealed state, the unfavorable γ texture components gradually strengthen. The intensities of the {111}〈112〉 and {111}〈110〉 textures increase from 1 and 4 to 4 and 8 respectively, showing a four-fold increase. The high-frequency core loss P1.0/400 of the product decreases from 14.35 W/kg to 12.4 W/kg, while the magnetic induction B50 decreases from 1.687T to 1.665T.

Key words: non-oriented silicon steel; cold rolling reduction rate; micro-structure; texture