二次退火温度对无取向硅钢组织和磁性能的影响

对1.2%Si无取向硅钢进行不同温度的二次退火试验,研究了不同二次退火温度对无取向硅钢组织和磁性能的影响。结果表明:二次退火能显著增大铁素体晶粒尺寸,降低无取向硅钢铁损;在780~820 ℃下进行二次退火,铁损降幅最大,达到1.0 W/kg,无取向硅钢的磁性能达到最佳水平,此时平均晶粒尺寸为83~114 μm。通过扫描电镜对不同温度二次退火后的试样进行析出物统计,发现试样中的析出物主要为MnS-Cu_xS,当二次退火温度为780~820 ℃时,0.1~0.2 μm的细小MnS-Cu_xS析出物比例最低。

Effect of secondary annealing temperature on microstructure and magnetic properties of non-oriented silicon steel

Secondary annealing experiment of 1.2%Si non-oriented silicon steel at different temperatures were carried out,and the effect of secondary annealing temperature on the microstructure and magnetic properties of the steel was investigated.The results show that the grain size of ferrite is increased and the core loss is reduced after secondary annealing processes.The core loss of experimental steel is reduced significantly in the annealing temperature range of 780-820℃.In this temperature range,the magnetic properties of non-oriented silicon steel is the best,the core loss reduction is 1.0 W/kg,and the average grain size is 83-114μm.Besides,the precipitates of the experimental steels were investigated by means of SEM.The results show that the main precipitate in the experimental steel is MnS-Cu_xS.The amount of fine MnS-Cu_xS precipitate with the size of 0.1-0.2μm is the lowest in the annealing temperature range of 780-820℃.