采用场发射扫描电子显微镜观察了取向电工钢中MnS粒子在热变形及不同温度保温后的析出形核行为.以经典的形核率理论为基础,确定了MnS粒子形核析出的更准确潜在位置密度,进而建立了改进的MnS析出形核模型.研究结果表明,MnS粒子主要在晶界和位错上形核,MnS在900℃析出时粒子密度最大.随热变形后保温温度的升高,位错密度及相应的MnS位错形核密度降低.理论计算与实验观察的结果符合良好.
Field emission scanning electron microscope was used to observe the precipitation nucleation behaviors of MnS parcicles after holding at different temperatures in an as-hot rolled grain-oriented electrical steel. The potential site density for MnS precipitating was accurately determined,and a modified nucleation model for MnS precipitating was proposed based on the classical nucleation theory. The experimental results indicate that the MnS particles nucleate dominantly at dislocations and grain boundaries. The maximum density of MnS nucleus is reached at 900℃ . The nucleation density of MnS particles and dislocation density decreases with increasing holding temperature after hot deformation. The theoretical calculations are well agreement with the expenmental observations.
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