本文用透射电子显微镜研究了具有代表性的六种低碳马氏体钢的显微组织,结果表明:含碳量较低的马氏体钢(指0.1—0.25wt-%C),淬火后一般都存在薄膜状残余奥氏体,低碳马氏体钢淬火时不可避免有自回火现象,自回火沉淀出的碳化物是六方晶格的ε碳化物,六种钢都能找到具有局部孪晶亚结构的板条晶,低碳马氏体在350—400℃回火时,ε转化成Fe_3C;回火温度提高至500℃时,孪晶消失,但马氏体板条晶的轮廓在600℃时仍可维持原状. In this paper, the microstructure of six typical low-carbon martensitic steels was investigated by transmission electron microscopy. The results show that the martensitic steels with low carbon content (0.1-0.25 wt-% C) Generally exist in the film-like residual austenite, low-carbon martensitic steel quenching inevitable self-tempering phenomenon, the self-tempering precipitated carbide hexagonal ε carbides, six kinds of steel can be found with When the tempering temperature is increased to 500 ℃, the twins disappear but the martensite laths crystallize The contour remains intact at 600 ° C.