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研究了在奥氏体区轧制、650℃模拟卷曲后含铜低碳低硅无取向电工钢中的析出相及其析出规律。结果表明:含铜低碳低硅无取向电工钢中的析出相主要有弥散分布的、等轴状的Cu偏聚区和形状近似正方形的颗粒状的AlN。Cu偏聚区在卷曲5min后即出现,其平均尺寸为20～30nm,且一旦形成长大缓慢。高分辨电子显微镜观察表明,偏聚区是由许多微区组成,且各微区的原子排列可能存在一定的对称性;而AlN在卷曲10min后才出现,大大晚于Cu偏聚区,且一旦形成长大迅速,卷曲32min后,其尺寸便达120nm。
The precipitated phases and their precipitation regularities in low carbon and low silicon non-oriented electrical steel after rolling in austenite region and simulating curling at 650 ℃ were studied. The results show that the precipitates in the low-carbon and low-silicon non-oriented electrical steel containing copper mainly consist of dispersed and equiaxed Cu segregation zone and granular AlN with square shape. Cu segregation occurs 5min after curling, the average size of 20 ~ 30nm, and once formed grow up slowly. High-resolution electron microscopy observations show that the segregation zone is composed of many micro-domains, and the atomic arrangement of each micro-zone may have some symmetry. However, AlN appears only after 10 min of curling, much later than the Cu segregation zone. Rapid growth, curling 32min, its size will reach 120nm.