退火工艺参数及母材性能对取向硅钢超薄带磁性能的影响

Effect of annealing process parameters and properties of base material on magnetic properties of ultra-thin grain-oriented silicon steel strip

采用EBSD技术对不同退火工艺处理后的冷轧取向硅钢超薄带样品进行研究,分析退火样品的显微组织、织构与磁性能的关系,讨论母材性能对超薄带性能的影响。结果表明:冷轧超薄带的退火组织均匀、Goss取向度高以及母材磁性能优良均可有效提升磁性能;退火升温速率主要影响晶粒尺寸、Goss取向度及磁性能;再结晶的平均晶粒尺寸改变,会影响最终超薄带的磁感应强度及铁损;在900℃退火5 min以上会明显发生再结晶,10~30 min内退火的超薄带磁性能变化较小,退火15 min获得最佳磁性能。此外,在1000℃及1100℃下退火的时间均不宜超过10 min,否则会恶化磁性能。

The cold-rolled ultra-thin gain-oriented silicon steel strips with different annealing parameters were studied by EBSD technology.The relationship between microstructure,texture and magnetic properties of annealed samples was analyzed,and the effect of properties of the base material on the performance of the ultra-thin strip was discussed.The results show that the annealing microstructure uniformity,high Goss orientation and better magnetic properties of the base material can effectively improve magnetic properties of the ultra-thin strip,and the annealing heating rate mainly affects the grain size,Goss orientation and magnetic properties;the change of the average grain size of recrystallization structure influences the magnetic induction and iron loss of the final ultra-thin band.Recrystallization obviously occurs after annealing at 900℃for 5 min,magnetic properties of ultra-thin strips change little after annealing for 10-30 min while the best magnetic properties can be obtained after annealing for 15 min.In addition,the annealing time should not exceed 10 min at 1000℃and 1100℃,otherwise the magnetic properties will deteriorate.