| 钢中贝氏体形核初期微观形貌及精细结构的TEM观察 |
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| 引用本文： | 武晓雷,陈光南,马朝利,康沫狂.钢中贝氏体形核初期微观形貌及精细结构的TEM观察[J].金属学报,1997,33(7):697-701. |
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| 作者姓名： | 武晓雷 陈光南 马朝利 康沫狂 |
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| 作者单位： | [1]中国科学院力学研究所 [2]西北工业大学 |
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| 基金项目： | 国家自然科学基金!59171031 |
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| 摘 要： | 利用ＴＥＭ研究了８Ｍｎ８ＳｉＭｏ钢贝氏体晶核初期篚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。
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| 关 键 词： | 贝氏体 形核 缺陷面 切变 钢 微观形貌 TEM |
| 收稿时间： | 1997-07-18 |
| 修稿时间： | 1997-07-18 |
TEM OBSERVATION OF MICROSTRUCTURES AND FINE STRUCTURES DURING BAINITIC NUCLEATION IN THE STEEL 8Mn8SiMo |
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| WU Xiaolei,CHEN Guangnan ,MA Chaoli,KANG Mokuang.TEM OBSERVATION OF MICROSTRUCTURES AND FINE STRUCTURES DURING BAINITIC NUCLEATION IN THE STEEL 8Mn8SiMo[J].Acta Metallurgica Sinica,1997,33(7):697-701. |
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| Authors: | WU Xiaolei CHEN Guangnan MA Chaoli KANG Mokuang |
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| Affiliation: | WU Xiaolei,CHEN Guangnan (Institute of Mechanics,Chinese Academy of Sciences,Beijing ),MA Chaoli,KANG Mokuang (Northwestern Polytechntical University,Xi'an ) |
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| Abstract: | 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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| Keywords: | bainite nucleation (lll) defect plane shear |
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