Mn对高牌号无取向硅钢组织、织构及磁性能的影响

Effect of Mn on the microstructure,texture and magnetic properties of high grade non-oriented silicon steel

本文借助OM、EBSD和磁性能测量仪,研究了Mn对高牌号无取向硅钢组织、织构和磁性能的影响。结果表明,与0.2Mn相比,1.6Mn热轧板再结晶过程受到较大程度的抑制,这导致旋转立方织构强度明显增强。经920℃常化后,相较于热轧板,常化板组织明显改善,且基本保留了热轧板的织构组分,但添加1.6%Mn对常化板织构影响较小。930℃退火后,相较于0.2Mn,1.6Mn成品板晶粒尺寸略大一些,同时不利的{111}织构含量几乎不变,有利的{100}织构含量降低,导致织构因子下降,因此磁感B5000由1.683T降至1.644T。对于铁损,Mn含量增高导致铁损P1.5/50由2.45 W/kg下降至2.35 W/kg,而高频铁损P1.0/400则可能由于涡流损耗大幅降低,导致其从19.29 W/kg明显降至17.36 W/kg。

The effect of Mn on the microstructure,texture and magnetic properties of high grade non-oriented silicon steel is investigated in this study by using OM,EBSD and magnetic property measuring instrument.The results show that compared with 0.2Mn,the recrystallization process of the 1.6Mn hot-rolled sheet is largely suppressed,which leads to a significant increase in the strength of the rotating cube texture.After being normalized at 920°C,the microstructure of normalized plate is significantly recovered compared with hot-rolled plate,and the texture type of hot-rolled plate is basically retained,but the addition of 1.6%Mn has a limited effect on the texture of normalized plate.After annealing at 930°C,the grain size of 1.6Mn annealed plate is slightly larger than 0.2Mn.At the same time,the unfavorable{111}texture content is almost unchanged and the favorable{100}texture content decreases,which results in a decrease of texture factor,so the magnetic induction B5000 is reduced to 1.644 T from 1.683 T.In the case of the iron loss,P1.5/50 is reduced to 2.35 W/kg to 2.45 W/kg,while the high frequency iron loss P1.0/400 is significantly reduced to 17.36 W/kg from 19.29 W/kg after adding 1.6%Mn.