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利用场发射电镜及能谱仪研究了取向电工钢薄、厚板坯铸锭中不同区域的析出相差异,确定了MnS、AlN及Fe3C的析出顺序和形貌特征。结果表明AlN以先析出的MnS为形核核心,形成粗大微米级的复合析出相。针状Fe3C既可以在复合析出相表面形成也可以在基体中单独出现,主要受冷却速度的影响。在1250℃保温1～2 h,AlN、Fe3C均可完全回溶,但部分MnS仍不回溶。MnS尺寸随着保温时间延长而增大。导致热轧板中沿轧向分布的粗大MnS,减弱了粒子钉扎力。
The differences of precipitation phases in different regions of thin and thick slab ingots of oriented electrical steel were studied by using field emission electron microscope and energy dispersive spectrometer. The precipitation order and morphology of MnS, AlN and Fe3C were determined. The results show that AlN is precipitated at the core of MnS first, forming a coarse micron-scale composite precipitates. Acicular Fe3C can form both on the surface of the composite precipitation phase can also appear in the matrix alone, mainly affected by the cooling rate. At 1250 ℃ for 1 ~ 2 h, AlN and Fe3C could be completely dissolved, but some MnS still did not dissolve. MnS size increases with holding time. Resulting in the hot rolled plate along the rolling distribution of coarse MnS, weakened the particle pinning force.