抑制剂形成元素对取向硅钢中夹杂物析出行为及热轧组织的影响

Influence of Elements Used as Inhibitor on Precipitation Behavior of the Inclusions and Hot Rolled Microstructure of Grain-oriented Silicon Steel

研究了铝、氮和锰、硫摩尔比对取向硅钢中夹杂物的析出行为及热轧组织的影响。结果表明,钢中的夹杂物是少量尺寸小于5μm的、以Al2O3为核心外包Mn S与Al N的复合物;钢中析出物主要为尺寸小于0.5μm的Mn S与Al N的复合抑制剂。其中氮铝摩尔比为0.9、锰硫摩尔比为15.7的取向硅钢中析出物数量最多,铸坯中数量为5 937个/mm3,热轧板坯中数量为7 024个/mm3;平均尺寸最小,铸坯中尺寸为0.17μm,热轧板坯中尺寸0.15μm,热轧后钢中析出物数量增加,并且热轧板坯边缘和中心组织都最均匀。

The influence of the molar ratio of Al to N and Mn to S on precipitation behavior of the inclusions and hot rolled microstructure of grain-oriented silicon steel has been studied in this paper.The results show that the inclusions in steel with different content of Al,N and Mn,S nucleate with Al2O3,where Mn S and Al N grow surrounding Al2O3,and their size is less than 5 μm.The main precipitates in steel are complex inhibitors of Mn S and Al N whose size is less than 0.5 μm.The number of precipitates is the most in the sample where the molar ratios of Al to N and Mn to S are 0.9 and 15.7 respectively,and its density are 5 937 / mm3 in slab and 7 024 / mm3 in hot roll plate.The average diameter of the resulting precipitates is smallest,which is 0.17 μm in slab and 0.15 μm in hot roll plate.The number of precipitates in hot roll plate increases when compared with that in slab,and the structure is the most uniform in edge and center of hot roll plate.