稀土元素Ce含量对50W470无取向硅钢显微组织及性能的影响

Effect of rare earth element Ce content on microstructure and properties of 50W470 non-oriented silicon steel

利用光学显微镜(OM)和扫描电镜(SEM)研究了不同稀土Ce含量的50W470无取向硅钢的铸坯、热轧板和冷轧退火板的宏观和微观组织,并采用磁性能测试仪测定其磁性能。结果表明:当稀土Ce的加入量从0增加到66×10^(-6)(质量分数)时,铸坯的柱状晶平均宽度从3.82 mm减小到3.24 mm,等轴晶率从43.1%增加到51.3%;热轧板的平均晶粒尺寸逐渐增加,从26.2μm增加到33.3μm,再结晶百分数从24%增加到37%;退火板的平均晶粒尺寸从36.2μm增加到39.3μm;磁性能测试表明,微观组织的变化有利于50W470无取向硅钢铁损降低和磁感提高。

Macro-structure and microstructure of as-cast plate,hot rolled plate and cold rolled annealed plate of 50W470 non-oriented silicon steel with different rare earth Ce content was studied by optical microscope(OM)and scanning electron microscopy(SEM),and their magnetic properties were measured by magnetic property tester.The results show that when the addition amount of rare earth Ce increases from 0 to 66×10^(-6)(mass fraction),the average width of columnar crystal of the as-cast plate decreases from 3.82 mm to 3.24 mm,and the equiaxed crystal ratio increases from 43.1%to 51.3%;the average grain size of the hot rolled plate gradually increases from 26.2μm to 33.3μm,and the recrystallization percentage increases from 24%to 37%;the average grain size of the annealed plate increases from 36.2μm to 39.3μm.The magnetic property test shows that the change of microstructure is conducive to the reduction of iron loss and the improvement of magnetic induction of the 50W470 non-oriented silicon steel.