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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 microscopy was used to observe the precipitation behavior of MnS particles in oriented electrical steel after thermal deformation and different temperature. Based on the classical nucleation rate theory, a more accurate potential density of MnS particles nucleation is determined, and an improved MnS precipitation nucleation model is established. The results show that MnS particles mainly nucleate at the grain boundaries and dislocations, and MnS particles have the highest particle densities when precipitated at 900 ℃. With the increase of holding temperature after hot deformation, the dislocation density and corresponding nucleation density of MnS dislocation decrease. The results of theoretical calculation and experimental observation are in good agreement.