Effect mechanism of intermediate annealing temperature on microstructure and texture of 3.5％Si non-oriented silicon steel during secondary cold rolling
Secondary cold rolling process was implemented for the trial production of high-grade non-oriented silicon steel,which had a thickness of 0.25 mm and a Si content of 3.5％.The evolution of microstructure and texture of the non-oriented silicon steel at different intermediate annealing temperatures(850,950 and 1050℃)was studied by means of OM,EBSD,XRD and square coil magnetic properties testing.The results show that with the increase of intermediate annealing temperature,the average grain size of the finished annealed sheet increases first and then decreases,and the strength of the cube and Goss textures of the finished annealed sheet increases first and then decreases,the magnetic induction strength B5000 of the finished annealed sheet increases first and then decreases,while the iron loss value P1.0/400 decreases first and then increases.When the intermediate annealing temperature is 950 ℃,due to the larger average grain size and the best grain uniformity,the number of shear bands after two-stage cold rolling is the highest,providing a large number of nucleation sites for cube and Goss textures during the annealing process of the finished sheet,resulting in texture strengths of 13.56 and 5.03,respectively,resulting in the highest magnetic induction intensity,with B5000 of 1.691 T,and the iron loss is the lowest,with P1.0/400of 13.36 W/kg.
non-oriented silicon steelintermediate annealing temperaturesecondary cold rolling processtexturemagnetic properties
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