对晶粒取向3％Si-Fe在二次再结晶早期阶段中MnS质点的形态和分布作了电子显微镜研究。确定了一般晶粒取向3％Si-Fe中MnS质点对初次晶界的抑制失效的最低温度约为1000℃。得到稳定的初次晶粒基体的一个必要条件是脱碳退火状态下MnS质点原始分布场的平均尺寸接近于质点产生有效抑制作用的Zener临界尺寸。MnS质点的抑制失效看来与质点粗化场分布特性没有明显的联系。在1000℃以上的温度,质点对初次晶界的抑制作用的丧失可归结为该温度下小于Zener临界尺寸的质点的全部溶解。
The morphologies and distributions of MnS precipitates in grain oriented 3％ Si-Fe during the early stage of the secondary recrystallization have been examined by electron microscope. The lowest temperature at which the breakdown of primary grain boundary inhibition provided by MnS precipitates could occur was found to be about 1000℃ for common grain oriented 3％ Si-Fe. The necessary condition to obtain stabilized primary grain matrix was that the average size of original distribution field of MnS particles in the as-decarburized state approaches the Zener critical size of particles below which effective inhibition action occurs. It was found that the breakdown of MnS precipitates inhibition could not be related to the distribution characteristics of coarsenning particle field. The breakdown of the precipitates inhibition action upon primary grain boundary above 1000℃ might be ascribed to the complete dissolving of the precipitates below Zener critical size at this temperature.
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