Formation And Evolution Of η And λ Recrystallization Texture In Silicon Steel Thin Sheets

Silicon steel has the largest dosage as soft magnetic materials, mainly used for the core of generators, motors, transformers and other power electronic devices. Recrystallization texture control is an important prerequisite for the manufacture of high magnetic silicon steel products.In the manufacturing process of silicon, Suppressing disadvantageous γ recrystallization texture and promoting advantageous λ and η recrystallization texture are the essential issue of texture control in silicon steel.In this paper, Fe-3%Si and Fe-1.5%Si thin sheets were achieved the optimization of X and η recrystallization texture by controlling the grain size of normalizing bands, cold rolling reduction and annealing heating rate and other factors. Furthermore, texture development of deformation and recrystallization was analyzed by X-ray diffraction and electronic backscattered diffraction (EBSD).Using conventional secondary cold rolling can achieve the secondary recrystallization of Goss grains in oriented silicon steel with no inhibitor.Upon the completion of primary recrystallization, Goss grains do not have the size advantage, but the misorientation angle of Goss grain boundary mostly distribut in the range of 20°～45°, so Goss grain can constitute high energy grain boundaries with the surrounding grains. By the moving of energy grain boundaries, Goss grains annex the surrounding grains with other orientations and grow.Double cold rolling with few reductions can increase the strength of λ recrystallization texture and suppress y recrystallization texture in non-oriented silicon steel with partial recrystallization from intermediate annealing.The λ grains with low energy storage from the intermediate annealing can turn into λ crystal nucleus after an appropriate deformation. Then the λ crystal nuclei take precedence over others and grow up selectively.