Bi对低温取向硅钢高温退火过程组织和织构的影响

以含Bi和不含Bi两种成分低温取向硅钢进行高温退火中断实验，借助磁测仪（MPG 200D）进行磁性能测量，借助金相显微镜观察晶粒尺寸，利用X射线衍射（XRD）对高温退火连续升温过程中织构进行研究分析。实验结果表明，添加Bi元素后，初次晶粒尺寸减小，二次再结晶晶粒尺寸增加至20~60 mm，成品磁性能更优。Bi加入后二次再结晶开始温度明显提高，含Bi试样和不含Bi试样发生晶粒异常长大的温度范围分别是1 080~1 100 ℃和1 060~1 080 ℃。织构分析结果显示，随着高温退火温度提高，{111}和{100}面织构逐渐减弱，{110}面织构和Goss织构逐渐增强，含Bi和不含Bi试样的高斯织构转变温度分别为1 100 ℃和1 080 ℃，随后高斯织构密度和体积百分比逐步增加，最终含Bi试样的高斯织构密度和体积百分比均高于不含Bi试样。

Effect of Bi on microstructure and texture during high temperature annealing of low temperature grain oriented silicon steel

The annealing processes of low temperature grain oriented silicon steel which containing bismuth（Bi）and Bi free components have been studied by interrupting test，and the magnetic properties were measured by magnetic determinator (MPG 200D), the evolution of texture and grain size was analyzed by X ray diffraction (XRD) and optical microscopy. The results showed that the primary grain size decreased and the secondary recrystallized grain size increased to 20~60 mm after the addition of Bi element. The onset temperature of secondary recrystallization was increased significantly after the addition of Bi element,and the temperature ranges of grain abnormal growth on containing Bi and Bi free sample were 1 080~1 100 ℃ and 1 060~1 080 ℃ respectively. The texture analysis showed that as the high temperature annealing temperature increased, the {111} and {100} textures were gradually weakened, the {110} texture and Goss texture were gradually enhanced. The texture transformation temperatures of containing Bi and Bi free samples were 1 100 ℃ and 1 080 ℃ respectively, then the Goss texture density and volume fraction increased gradually. The Goss texture density and volume fraction of Bi containing samples were higher than those of Bi free samples.