不同冷轧退火工艺下薄带连铸无取向硅钢的组织和磁性能

Microstructure and Magnetic Properties of Strip-Casting Non-oriented Silicon Steel at Different Cold Rolling and Annealing Processes

针对1.5 mm厚双辊薄带连铸Fe-1.3%Si无取向硅钢铸带在不同变形量(56.7%,66.7%,76.7%)下进行冷轧,之后再在不同温度(800,850,900,950℃)和时间(1,3,5,7min)下进行退火处理,研究了硅钢的显微组织、析出相和磁性能。结果表明:在退火过程中钢中的析出物以MnS为主,其尺寸主要在30~40nm之间,对晶粒的钉扎作用较为明显;退火硅钢的磁感B50稳定在1.77~1.80T;随着变形量从56.7%增大到76.7%,再结晶晶粒明显细化,退火硅钢的铁损P_(15/50)从5.54 W·kg^(-1)下降到4.23 W·kg^(-1);变形量为66.7%的硅钢在900℃退火5min后,再结晶晶粒较大,硅钢的磁性能最优,P_(15/50)约为4.54 W·kg^(-1)。

A 1.5 mm thickness Fe-1.3%Si non-oriented silicon steel ascast stop proclucect t）y strip casnng was cold rolled at different reductions （56.7%, 66.7%, 76.7%） and annealed at different temperatures （800, 850, 900, 950 ℃） and time （1, 3, 5, 7 min）. The microstructure, precipitate and magnetic properties of the silicon steel were investigated. The results show that MnS particles with size of 30--40 nm were the main precipitate during annealing, which had significantly pinning effect on grain. The magnetic induction B50 of annealed silicon steel maintained at 1.77--1.80 T. With the increase of cold rolling reduction from 56.7% to 76.7%, the average size of recrystallized grains refined obviously and core loss P15/50 decreased from 5.54 W.kg-1 to 4.23 W.kg-1. Relatively large recrystallized grains were obtained when the cold rolled silicon steel with 66.7% reduction was annealed at 900 ℃ for 5 min, leading to the optimal magnetic properties （P15/50 = 4.54 W·kg-1 ）.