利用TEM研究了8Mn8SiMo钢贝氏体晶核初期长大过程中的微观组织及精细结构实验观察到初期贝氏体具有应力应变促发亚单元形核特征，相变单元的三维形貌呈薄片状；贝氏体／奥氏体相界面可形成（111）f缺陷面，为母相奥氏体塑性协调变形亚结构．实验结果表明贝氏体的初期形成具有切变特征．
The microstructure and substructure of the bainitic-ferrite at the most early stage of growth in an Fe-0.79C-8.3Mn-0.87St-0.50Mo steel are studied by TEM. It is observed that the bainite nuclei exhibit a thin plate morphology. And, the bainite formation has the character of catalysis nucleation by sub-units. Moreover, the existence of (lll)f defect plane is firstly observed, and its formation is considered to be the result of the plastic accommodation effect occurred in parent austenite during bainitic nucleation and growth. Defect planes, in fact, to be the glide plane of austenite matrix, consist of part of the bainitic-ferrite/austenite interface. Thus, the formation of bainitic-ferrite is of shear nature.
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