Ce对2.9%Si-0.8%Al无取向硅钢夹杂物变质的影响

研究了添加单一稀土元素Ce后2.9%Si-0.8%Al无取向硅钢中夹杂物的变质机理。依据冶金热力学理论计算了Ce添加后,钢液中可能生成的夹杂物种类,分析了各种夹杂物存在的稳定性和相互转化的条件。在此基础上,利用SEM、EDS研究了Ce对无取向硅钢中夹杂物数量、尺寸、形貌及类型的影响。结果表明:适量的Ce显著降低了无取向硅钢中微细夹夹杂物(小于1μm)的数量,增加了粗大夹杂物(2~5μm)数量;Ce使AlN、Al_2O_3等夹杂物变性为球状的CeO_2S_2+AlN、CeS+CeAlO_3和CeS+Al_2O_3等复合夹杂物,有效抑制了钢中MnS的析出。

Effect of Ce on inclusions modification in 2.9%Si-0.8%Al non-oriented electrical steel

The mechanism of inclusion modification with Ce in 2.9% Si-0.8% Al non-oriented electrical steel was discussed.The possible existence of inclusions in non-oriented electrical steel with Ce was calculated by metallur-gical thermodynamic,and then the effects of Ce on amount,sizes,morphology and type of inclusions were investi-gated by scanning electron microscope with X-ray analysis spectrometer (SEM/EDS).The results show that the amount of tiny inclusions (less than 1μm)decreases significantly and coarse inclusions (2 -5μm)increase in the non-oriented electrical steel with proper Ce content.Ce can also change the AlN,Al2 O3 inclusions without regular shape to spherical shape such as CeO2 S2 +AlN、CeS+CeAlO3 and CeS+Al2 O3 complex inclusions.Moreover ap-propriate Ce content can inhibit the precipitation of MnS inclusion.