研究了38Si2Mn2Mo钢等温下贝氏体中和淬火回火后马氏体中析出的碳化物。在下贝氏体中存在两组ε-碳化物，它们与贝氏体铁素体保持Jack位向关系，而与奥氏体无固定取向关系，ε-碳化物的惯习面为{100}b，未见碳化物在奥氏体一侧析出。表明下贝氏体具有碳过饱和度，ε-碳化物是从贝氏体铁素体中析出的，具有与回火马氏体相似的切变特征。
The carbides precipitated in the isothermal lower bainite and the tempered martensite in 38Si2Mn2Mo steel were studied using TEM. The results show that two groups of ε-carbides exist in the lower bainite,they keep a Jack O.R. with the bainitic ferrite,but they don't keep fixed and unique O. R. with austenite matrix. The H.P. of ε-carbide was determined to be {100}b/{1120}ε. The precipitation of carbide didn't be found in austenite . These show that a carbon - supersaturation occurred in the lower bainite, the ε-carbide was precipitated from the bainitic ferrite,and the phase-transformation of bainite has the features of shear in analogy to the tempered martensite.
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