Evolution of the Shear Band in Cold-Rolling of Strip-Cast Fe-1.3% Si Non-Oriented Silicon Steel.

Yuanxiang Zhang,Qi Chen,Yukun Xia,Yang Wang,Feng Fang,Kuangyu Zhai,Jiecheng Zhang,Raja Devesh Kumar Misra,Hao Dun,Yu Zhang

doi:10.3390/ma14040775

Abstract

Cube texture and microstructural evolution of as-cast non-oriented silicon steel (1.3% Si) during cold rolling and annealing were studied. The results showed that the as-cast microstructure with grain size in the range of 100–500 μm had a weak texture. The strong orientation was mainly located at {100} and {110} planes. A significant content of shear-deformed grains oriented with {110}<110> were obtained by cold-rolling, and many regions oriented with Cube texture were distributed in the shear bands. During cold-rolling, the orientation of the shear-deformed microstructure tilted towards the {111}<112> orientation, while the matrix orientation retained {110}<110>. On further cold-rolling, the residual part of {110}<110> experienced shear deformation, forming more shear bands, strengthening the Cube orientation. During annealing, Cube orientation grains nucleated in the shear bands leading to strong Cube texture, and corresponding B50 was 1.83T/1.79T.

Highlights

The non-oriented silicon steels (0.8–2.0% Si) are widely considered for small and medium-size motor cores and used as a soft magnetic material
Park [9] studied 2% non-oriented silicon steel, where Cube and Goss grains were found on α and γ shear bands, Cube grains were less than Goss, and the directed nucleation led to recrystallization of silicon steel
We have discussed the effect of shear deformation on recrystallized microstructure, texture and magnetic properties of Fe-1.3% Si strip during cold-rolling

Summary

Introduction

The non-oriented silicon steels (0.8–2.0% Si) are widely considered for small and medium-size motor cores and used as a soft magnetic material. Their high efficiency is mainly attributed to the high magnetic inductance and low iron loss that requires the increase of favorable texture and reduction of harmful texture [1]. Recent studies have focused on the formation of Cube, Goss, and γ texture and optimizing magnetic properties by rolling and annealing, or by controlling the initial microstructure and texture of slab [3,4,5,6,7,8]. The hotrolled grains can coarsen by normalized annealing and γ texture component decreases, which promotes shear deformation and the development of Cube and Goss textures

Methods

Results

Conclusion