Research on the Abnormal Grain Growth of Goss Grains in Strip-Cast 4.5%Si Grain-Oriented Electrical Steels

Abstract

In conventional production of grain-oriented electrical steel, the content of silicon is limited to 3.0%~3.4%, which could control the ‘γ→α’ transformation process to obtain fine grain sizes in hot-rolling and disperse AlN particles in normalizing. In this study, the precipitation behaviors of S ans N in 4.5% Si-Fe alloy are inhibited during twin-roll strip casting process. And then the ideal microstructure and texture was obtained after the two-stage cold rolling and primary annealing. The evolution of microstructure and texture during the subsequent high temperature annealing were investigated. The results revealed that a sharp and developed Goss texture has been achieved by secondary recrystallization in the final annealing step and the magnetic induction B8 /Bsis above 1.76/1.90T.