The Evolution On The Cold-rolled And Recrystallization Texture Of The High Brand Non-oriented Silicon Steel

Non-oriented silicon steel is soft magnetic material widely used in electric power and electronic industry, of which the high-grade non-oriented silicon steel is mainly used in the manufacture of large and medium-sized motor and iron core of the generator. The power consumption of these equipments is obvious, and most of them are under the state of long period and continuous operation. The slight improvement of working efficiency can save a lot of energy. It has an obvious economic and social benefit. Therefore, from the viewpoint of energy saving, to increase magnetic induction and decrease iron loss is always an important topic in the research field of silicon steel. The magnetic properties of silicon steel are mainly affected by the composition, grain size and texture. While the optimization of composition and grain size is close to the limit, there is still large space in texture optimization. The paper studied the effect of rolling process and rolling temperature on the texture evolution and magnetic properties of high-grade non-oriented silicon steel with the content of (Si+ Al) more than 3%. The main research contents and results are as followed:(1) Two rolling processes with room temperature rolling after 100℃ rolling and 100℃ rolling after room temperature rolling were studied respectively to explore the effect of rolling process on the recrystallization textures and magnetic properties of Fe-3.0%Si-0.9%Al non-oriented silicon steel. The results show that recrystallization texture and magnetic properties were improved before or after room temperature rolling with the reduction rate more than 45%, and the favorable λ (<100>//ND) significantly enhanced.(2) Recovery annealing was added in the annealing process, and this remarkably influenced recrystallization textures and magnetic properties of Fe-3.0%Si-0.9%Al non-oriented silicon steel. In the different recovery temperature, the recrystallization texture were mainly fiber textures of η (<100>//RD), λ (<100>//ND) and γ (<111>//ND). λ texture enhanced with the recovery temperature improved. Especially after 500℃ annealing, λ texture was significantly enhanced, and y texture was weakened. Thus, the magnetic induction of the sample after 500℃ annealing. The reason was that remarkable recovery can reduce the energy storage of α and γ deformed grains, and then the nucleation of γ recrystal grain was reduced. This weakened γ texture and strengthened λ texture.(3) Evolution of X texture during grain growth in Fe-3.0%Si-0.5%Al and Fe-3.0% Si-2.5%Al non-oriented silicon steels were contrast analyzed by EBSD. The experiments show that the formation of strong λ recrystallization texture is mainly because λ grain had the obvious advantage of size in the stage of recrystallization just completed. Bsides, the addition of Al can significantly enhance the intensity of X recrystallization texture in 3.0% Si non-oriented silicon steel.