退火加热速度对高牌号无取向硅钢组织、织构及磁性能的影响

Effect of heating rate on microstructure,texture and magnetic properties of high grade non-oriented silicon steel during annealing

采用光学显微镜、电子背散射衍射技术和爱泼斯坦方圈方法等研究了退火过程中不同加热速度对高牌号无取向硅钢显微组织、织构和磁性能的影响。结果表明:随着加热速度从10℃/s提高到70℃/s,试验钢最终退火后的平均晶粒尺寸逐渐变小,但加热速度达到100℃/s时,平均晶粒尺寸开始变大。加热速度达到40℃/s以上时试验钢最终退火后的γ取向线织构得到抑制,加热速度达到100℃/s及以上时λ取向线织构强度显著提高。加热速度为100℃/s时,试验钢最终退火后的铁损P_(1.0/400)最低,其各向异性也最低;随着加热速度的提高,磁感B_(5000)呈上升趋势。

Effect of different heating rates on microstructure,texture and magnetic properties of high grade non-oriented silicon steel during annealing was studied by means of optical microscope,electron backscatter diffraction technique and Epstein frame method.The results show that the average grain size of the experimental steel after final annealing gradually decreases with the heating rate increasing from 10℃/s to 70℃/s,but the average grain size starts to increase when the heating rate reaches 100℃/s.When the heating rate reaches above 40℃/s,theγorientation line texture of the experimental steel after final annealing is suppressed,and when the heating rate reaches 100℃/s or above,the strength ofλorientation line texture is significantly improved.When the heating rate is 100℃/s,the iron loss P_(1.0/400) of the experimental steel after final annealing is the lowest,and its anisotropy is also the lowest.With the increase of heating rate,the magnetic induction intensity B_(5000) shows an upward trend.