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利用场发射扫描电子显微镜观察了试验材料Fe-3.12%Si-0.11%Mn-0.021%S中MnS析出粒子在变形量为0%～68%的冷压缩加工过程中的分布状态,统计了MnS粒子的总面密度及不同尺寸范围粒子的面密度,分析了冷压缩加工过程中MnS粒子的变化规律。结果表明,冷变形过程造成了几十纳米尺寸MnS粒子的碎化和10 nm以下粒子的少量回溶行为;但未能造成尺寸过于粗大粒子的细化。分析认为,MnS粒子与基体的界面能和塑性变形造成位错密度的明显升高构成了细小粒子回溶的驱动力。MnS粒子在冷轧过程中的细化,有利于防止初次再结晶晶粒粗化,促进取向电工钢二次再结晶过程的顺利进行及锋锐Goss织构的生成。
The distribution of MnS precipitates in Fe-3.12% Si-0.11% Mn-0.021% S during cold compression process with deformation of 0% -68% was observed by field emission scanning electron microscope. The distribution of MnS particles The total surface density and the surface area density of particles in different size range, the change law of MnS particles in cold compression process was analyzed. The results show that the cold deformation process resulted in the reduction of several nanometer size MnS particles and the small amount of solution back to 10 nm, but failed to cause the refinement of oversize particles. The analysis shows that the interfacial energy and plastic deformation of MnS particles lead to the obvious increase of dislocation density, which constitutes the driving force of the fine particles to be dissolved. The refinement of MnS particles in the cold rolling process is conducive to preventing the primary recrystallization grains from coarsening and promoting the secondary recrystallization process of the oriented electrical steel and the generation of Fengrui Goss texture.