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利用高分辨扫描电子显微镜观察了Fe-3%Si合金中MnS粒子的分布及经高温退火后的变化,借以探索MnS粒子的统计分析方法及其抑制作用原理。热力学计算与观察结果的对比分析显示,随退火温度的升高不仅出现MnS粒子的溶解行为,也存在粗化现象,但粗化过程并不显著,粒子仍基本保持弥散细小状态,因而可以发挥抑制晶界迁移的作用。MnS粒子的高温溶解是造成其抑制作用弱化的主要原因。分析认为,MnS明显高于基体的比容是造成其难以粗化并保持抑制作用的重要原因。
The distribution of MnS particles in Fe-3% Si alloy and the change after annealing at high temperature were observed by high-resolution scanning electron microscopy to explore the statistical analysis of MnS particles and their inhibition mechanism. The comparison between the thermodynamic calculation and the observed results shows that not only the dissolution behavior but also the coarsening phenomenon of MnS particles appear with the increase of annealing temperature, but the coarsening process is not significant, and the particles are still in a finely dispersed state and thus can suppress The role of grain boundary migration. MnS particles at high temperature dissolution is the main reason for the weakening of its inhibition. Analysis shows that, MnS was significantly higher than the matrix of specific volume is difficult to make it coarsening and maintain the inhibitory effect of the important reasons.