The Study On Normalization Process And The Primary Recrystallization Mechanism Of Fe-3%Si Oriented-silicon Steel

Oriented silicon steel, which have {110} <001> texture of soft magnetic materials, is an important material for making transformers, motors and various electrical components, widely used in electricity, electronics and aerospace fields. Recrystallization annealing and normalizing are the key steps in oriented silicon steel manufacture, Investigating the structure,texture and inhibitor precipitation state during those process has an important theoretical and practical significance on guiding grain-oriented silicon steel production.In this paper, industrial Fe-3%Si oriented silicon steel is taken as experimental subjects.After normalizing and cold rolling, Hot-rolled sheet is primary recrystallization annealed at different temperature. Researching systematic the evolution of macro-texture, microstructure and grain orientation of oriented silicon steel at primary recrystallization process by XRD,SEM and EBSD etc. Exploring the influence of normalizing process on the final magnetic and Cu₂ S inhibitor by using SEM and EDS analysis method, determining the optimal normalization process.It was found that the preferential nucleation sites are shear bands and deformed grain boundaries at the early stage of recrystallization. But the nuclei at the shear bands became to the main recrystallized texture with the development of recrystallization. ?-fiber texture gradually weakened, while ?-fiber texture increased in primary recrystallization, the evolution of texture in surface layer and core layer are similar. Goss grains locate in the surface layer,but not the main texture. According to the experimental data and calculation results using misorientation principle, the misorientation between recrystallized grains and the surrounded deformed matrix was mainly distributed in the range between 25° and 45°. High stored energy of the deformed ?-fiber components results in preferred recrystallization at the early stage of recrystallization. The recrystallized grains oriented with {111}<110> and {111}<112>maintain prominent from beginning to the end of the recrystallization. The proportion of sporadical Goss recrystallized grains is low after completion of the recrystallization, the misorientation between Goss grains and the surrounded grains are high angles which rang from 25° to 45°.Precipitating more inhibitor particle which inhibiting primary crystal grows, improving the content of {111}<112> texture after completion of the primary recrystallization, higher magnetic property and lower iron loss can be realized by normalization process. For Fe-3%Sioriented silicon steel, which based on Cu₂ S inhibitor, the optimal normalization process is normalizing 10 min at 1100? temperature, water quenching after 800? heat preservation.The size and quantity of Cu₂ S particle reach ideal condition of inhibitors, the pinning effect to grain boundary is strongest, the magnetic of product is the best.