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(1,3,5,7 min)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30~40 nm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1．77~1．80 T；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P15/50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5 min后,再结晶晶粒较大,硅钢的磁性能最优,P15/50约为4．54 W.kg－1.
A 1 .5 mm thickness Fe-1 .3%Si non-oriented silicon steel as-cast strip produced by strip casting 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 6 6 .7% reduction was annealed at 900 ℃ for 5 min,leading to the optimal magnetic properties (P15/50= 4.54 W.kg-1 ).
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