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应用透射电镜研究了38Si2Mn2Mo实验用钢320℃等温处理后的下贝氏作组织的晶体学和精细结构．贝氏体含有中脊线、相变单元、残余奥氏体及ε碳化物，贝氏体及奥氏体内存在大量位错．电子衍射和晶体学测量表明下贝氏体惯习面为｛11，7，15｝f型，贝氏体与奥氏体的取向关系为G—T关系．相邻贝氏体板条绕公共面法线＜110＞相对旋转54．7°或60°，形成板条间的不同取向关系，包括近似的｛112｝b孪晶关系．下贝氏体的晶体学位向关系和惯习面分别与板条马氏体的相同或相近，且与由马氏体晶体学表象理论预测的基本一致，说明下贝氏体相交具有马氏体相变的特征．
The crystal structure and fine structure of the underglass structure of 38Si2Mn2Mo steel after being isothermally treated at 320 ℃ were investigated by transmission electron microscopy. Bainite contains a large number of dislocations in the midline, phase transition units, residual austenite and ε carbide, bainite and austenite. The results of electron diffraction and crystallography show that the lower bainite is {11, 7, 15} f, and the orientation relationship between bainite and austenite is G-T. Adjacent bainite laths rotate 54.7 ° or 60 ° relative to common plane normals <110> to form different orientations of the laths, including an approximate {112} b twins relationship. The lower bainite crystallographic orientation relationship and the habitual surface are respectively the same as or similar to the lath martensite, which is basically the same as that predicted by the martensitic crystallography theory, indicating that the lower bainite intersects with the martensite Characteristics of phase change.