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,respectively.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 variation of average magnetic induction value(B_8)and core loss value(P_(17/50))were manifested to be Mshaped and W-shaped curves,respectively.When nitrogen content reached 0.016 0%,the best value of the average magnetic property of the final product was obtained as follows:the B_8 and P_(17/50) were 1.921 Tand 0.968W/kg,respectively.Meanwhile,the best performance,B_8 and P_(17/50),of single sheet was 1.964 Tand 0.854 W/kg.