Effect of Nitrogen Content on Primary Recrystallization Behavior and Magnetic Property of Hi-B Steel

摘要

The effect of nitrogen content on primary recrystallization microstructure,texture and magnetic property of Hi-B steel was studied by means of optical microscopy (OM),scanning electron microscopy (SEM),and electron backscatter diffraction (EBSD).When nitrogen content increased gradually from 0.005 5% to 0.031 0%,the primary grain size and variation coefficient of nitrided sheet reduced from 26.85μm,0.590 to 18.87μm,0.525-0.565,re-spectively.Meanwhile,the primary recrystallization texture style of nitrided sheet was nearly identical to the texture style of decarburized sheet before nitriding treatment,but exhibiting a certain change on texture intensity.The varia-tion of average magnetic induction value (B8)and core loss value (P17/50)were manifested to be M-shaped and W-shaped curves,respectively.When nitrogen content reached 0.016 0%,the best value of the average magnetic prop-erty of the final product was obtained as follows:the B8 and P17/50 were 1.921 T and 0.968 W/kg,respectively. Meanwhile,the best performance,B8 and P17/50 ,of single sheet was 1.964 T and 0.854 W/kg.