The Study Of Microstructure And Properties Of No-orientation Silicon Steel By Twin-roll Casting Process

In this paper, with3%Si non-oriented silicon steel for the research, the investigation were carried out on the evolution of microstructure and texture under the influence of hot rolling process during one stage cold rolling and two stages cold rolling in the twin-roll casting process. In addition, with6.5%Si Non-oriented silicon steel for the research, the investigations were carried out on the evolution of Microstructure and texture. The major work and research achievement:1.The effects of hot rolling on the evolution of microstructure, texture and magnetic properties during twin-roll casting process were studied. The texture of finally annealed sheet with directly cold rolling is mainly X fiber texture and high density y fiber texture. The texture of finally annealed sheet with additional hot rolling is mainly λ fiber texture, low density y fiber texture and Goss texture. Hot rolling weakens y fiber texture and enhances Goss texture. Compared with the two processes, hot rolling improve average magnetic induction (B50) of0.35mm annealed sheet and the average iron loss (P15/50) of0.35mm annealed sheet, and the grain size improve86.6μm.2. The effects of hot rolling before first cold rolling which is belonged to two stages cold rolling on the evolution of microstructure and texture during twin-roll casting process were studied. The texture of finally annealed sheet with directly two stages cold rolling is mainly λ fiber texture, y fiber texture and deflective Goss texture. The texture of finally annealed sheet with additional hot rolling is mainly λ fiber texture, low density y fiber texture and high density Goss texture. Hot rolling weakens y fiber texture and enhances Goss texture. Compared with the two processes, hot rolling improve average magnetic induction (B50) of0.35mm annealed sheet and the average iron loss (P15/50) of0.35mm annealed sheet, and the grain size is more homogeneous.3. The microstructure and magnetic properties of6.5%Si Non-oriented silicon steel by twin-roll casting process were studied. The texture of finally annealed sheet with twin-roll casting process enhances λ fiber texture of finally annealed sheet and weakens y fiber texture of finally annealed sheet. The evolution mechanism of recrystallization is the orientation nucleation and optimizing growth mechanism. The magnetic induction (B8) with rolling direction of0.5mm annealed sheet improves0.11T and the iron loss (P10/400) of0.5mm annealed sheet reach18.40W/kg.4. The rolled plane appearance of6.5%Si Non-oriented silicon steel produced by warm rolling is smooth without crack. But there are small cracks on the edge of sheet. So warm rolling can improve plastic of6.5%Si Non-oriented silicon steel.