含稀土取向硅钢高温铁素体区的再结晶及抑制剂析出行为

Recrystallization and inhibitor precipitation behavior in high temperature ferrite zone of oriented silicon steel containing rare earth

利用Gleeble 1500D、SEM、TEM、ICP等研究手段,分析了含稀土取向硅钢在1200℃铁素体区热轧变形30%、保温不同时间后水冷的再结晶及抑制剂析出行为。结果表明,含稀土取向硅钢高温铁素体区热轧后仅发生动态回复,未发生动态再结晶,析出相的数量没有明显增加;热轧后保温20 s左右开始发生静态再结晶,抑制剂析出相开始析出并且长大,再结晶发生率越高,析出相体积分数增长越快。变形结束后析出相中Cu2S和MnS数量相差不多,再结晶发生率为64%时,MnS增长约7.4%,Cu2S增长约19.34%。析出相大多于晶内析出,随保温时间延长部分抑制剂逐渐在晶界处形核并长大。

Recrystallization and inhibitor precipitation behaviors of oriented silicon steel containg are earth hot rolled at 1200℃in the ferrite zone with 30%deformation,held for different time and then cooled in water were analyzed by using Gleeble 1500D,SEM,TEM,ICP.The results show that after hot rolling at high temperature in the ferrite zone,only dynamic recovery occurs,no dynamic recrystallization occurs,and the amount of precipitated phase in the steel does not increase significantly.After hot rolling and holding for about 20 s,static recrystallization occurs,and the inhibitor precipitated phase starts to precipitate and grows.The higher the recrystallization rate,the faster the volume fraction increasing of precipitated phase.After deformation,the amount of Cu2S and MnS in the precipitated phase is similar.When the recrystallization rate is 64%,MnS increases by about 7.4%and Cu2S increases by about 19.34%.At the same time,most of the precipitated phases are precipitated in the grains,and with the prolongation of holding time,the precipitated phase nucleates and grows up gradually on the grain boundaries.