Effect Of Asymmetric Rolling And Annealing Process On The Microstructure,Texture And Properties Of Non-oriented Silicon Steel

As an important soft magnetic material,non-oriented silicon steel is widely used in laminated magnetic cores of motors and generators in power,electronics,military and other industries.Its finished product requires high magnetic properties,which requires strict control of the organization and texture in the production process.In this paper,the same thickness of non-oriented silicon steel plate was prepared by controlling the rolling speed ratio,rolling temperature and rolling reduction per pass.The effects of different process parameters on rolling and recrystallization microstructure,texture and properties of non-oriented silicon steel were studied,and the texture evolution mechanism was clarified.The following conclusions were reached:1.Asymmetric rolling can introduce more shear deformation,produce more shear bands and distribute more uniformly.Small reduction cold rolling and warm rolling can also introduce more shear bands and make their distribution uniform.2.The texture evolution of asymmetric rolling samples at different layers is quite different.After annealing at 650~oC,the nucleation of Goss and Cube-oriented grains is inhibited on the fast roll surface,while the center surface is normal.However,after annealing at 750~oC,the fast roll surfaces are mainly Goss and Cube-oriented grains,and the?-oriented grains in the middle layer dominate.After annealing at 850~oC,the asymmetric rolling sample is mainly?texture,while the symmetric rolling sample is still dominated by?texture and supplemented by?texture.3.Asymmetric rolling with small reduction significantly changed the texture strength after rolling,and increased the strength of{112}<110>,{100}<110>,{111}<110>and{111}<112>texture components.After annealing,the texture evolution varies greatly at different layers.After annealing at 650~oC,a small amount of Goss and Cube oriented grains appear in the central layer.However,after annealing at 750~oC,obvious Goss and Cube-oriented grains appear on the fast roll surface.4.By studying the macro-texture evolution during warm rolling and annealing with different processes,it is found that warm rolling significantly improves the strength of{112}<110>orientation in the fast roll surface.After annealing at 650~oC,there are obvious Goss-oriented grains in the fast roll surface and no in center surface.After annealing at 750~oC,the fast roll surface exhibits obvious?and Goss textures.In the central layer,all samples showed obvious Goss orientation.In addition,obvious Cube texture was also produced in the ASRW1.3sample.After annealing at 850~oC,all samples exhibit strong?and?textures.5.Single pass reduction rate has great influence on the mechanical properties of non-oriented silicon steel,and high reduction rolling can obviously improve the tensile strength of the material.With the increase of annealing temperature,the tensile strength of the material gradually decreases,and its elongation gradually increases.However,after complete recrystallization(750-850~oC),the variation of elongation is complex.6.The Goss and Cube textures can significantly improve the magnetic induction intensity of non-oriented silicon steel,while the?texture deviates from?=0~o/45~o/90~o,and its optimization degree on the magnetic induction intensity of the material is less than that of the Goss and Cube textures.