【摘要】 魏氏铁素体、上贝氏体和板条马氏体均是过冷奥氏体板条状相变产物，它们的ＦＣＣ／ＢＣＣ相界都接近（１１１）ｆ密排面。本文用高分辨电镜在原子尺度上观察证实了板条马氏体相界台阶—位错结构，结合相变晶体学改进了板条马氏体和魏氏铁素体相界结构模型，这两个模型代表了（１１１）ｆ／（０１１）ｂ原子界面外延匹配可能的位错配置类型，同它们各自的长大动力学相容。贝氏体不可能有上述二者之外的相界结构，应通过试验确定，它属于上述两种模型中哪一种。文中研究表明，结合相变晶体学精确地实验和分析贝氏体相界结构，并借以考察其长大本质至关重要更多还原

【Abstract】 Upper bainite bears a lath\|shaped morphology closely resembling to Widmanstɑtten ferrite as well as lath martensite.They are all the transformation products of over\|cooled austenite and each has an irrational FCC/BCC interface very near to the close\|packed plane (111)\-f.The step\|dislocation structure of the lath martensite interface has been verfied in an atomic scale by high resolution electron microscope.The interface structure models of lath martensite and Widmanstɑtten ferrite have been improved on the basis of the epitaxial interface dislocation theory as combined with their experimental crystallography.The two models represent all the possible interface categories for the epitaxial interface conjugated along the close\|paked (111)\-f/(011)\-b plane,being compatible with their respective growth kinetics.It appears that there is no another model for upper bainite interface except the preceeding ones.The type of the bainite interface will be verified by experiments.Investigations in the present work show that accurate experiments and relevant analyses of the interface structure combined with a given variant of crystallography may be the crucial routine for determining the interface structure and in turn identifying the growth mechanism of the bainite.F C C/ B C C Interface Structure and Gro wth Mechanismof Lathshaped Tr更多还原