含铜低温热轧取向硅钢初次再结晶组织研究

Primary recrystallization microstructure of low temperature hot roll oriented silicon steel bearing copper

为研究含铜低温热轧取向硅钢再结晶组织,采用3种不同的初次再结晶退火工艺进行热处理。结果表明,脱碳退火前的高温退火工艺有助于增加硅钢初次再结晶组织中20°-45°晶界比率;采用渗氮工艺,可在大幅提高∑5晶界比率的同时增大晶粒尺寸。应用晶粒尺寸阈值公式计算出的初次晶粒大小约为8μm,计算结果与试验数据相符。

Three different heating methods have been used for the study of low temperature hot roll oriented silicon steel bearing copper.The results show that： high temperature heating prior to decarburization annealing can improve the proportion of 20°～45° boundaries in the primary recrystallization microstructure;nitriding process can significantly improve the proportion of ∑5 boundaries and increase the grain size.Calculation shows that the primary recrystallization grain size is about 8 μm by the critical grain size formula,which is consistent with the experimental data.