等温淬火的含Si超高强度钢往往存在(M-A)组织和转变不完全的贝氏体组织。在贝氏体区等温组织中的残余奥氏体多存在于前两种组织中。碳化物的类型与残余奥氏体的分布、形态有关。在180,300,320和420℃下等温形成的贝氏体中均存在有ε碳化物。马氏体α或贝氏体,奥氏体A和ε碳化物间的取向关系为碳化物可从α/A界面A侧析出。
An observation under TEM was made of the (M-A) structure and "bamboo shaped" bainite in the isothermally quenched ultra high strength steels containing Si after the isothermal transformation The retained austenite in the isothermal structure of bainite region at temperature≥300℃ is often found in the M-A and "bamboo shaped" bainite In the bainite formed isothermally at 180, 300, 320 and 420℃, the ε-carbide is observed. The type of carbide in decomposition products is related to the distribution and morphology of retained austenite. The ε-carbide may precipitate along the austenite side of martensite/austenite boundary.
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