用透射电镜对几种高碳低合金钢中的共析渗碳体进行了观察发现渗碳体片不是均一的.在共析渗碳体内存在一些取向一致、宽度不等的铁素体亚片层、这些铁素体亚片层可把片状共析渗碳体隔断铁素体亚冲层所在平面的指数以｛211｝F为多.本文还分析比较了常见的条纹衬度与铁素体亚片层的区别，讨论了共析渗碳体中铁素体亚片层的形成机理
The eutectoid cementite in several rail steels has been studied by means of TEM.It was found that the eutectoid cementite lamellae arc not of homogeneous structure but contain some ferrite sub-lamellae with different widths and same orientation. The continuity of the eutectoid cementite lamellae was reduced when the ferrite sub-lamellae were incorporated. The planar indices of the ferrite sub-lamellae are found usually close to {211}F.Some contrast fringes observed at the cementite/ferrite interface were analyzed and compared with the sub-lamellae in the eutectoid cementite. The formation mechanism of ferrite sub-lamellae in eutectoid cementite was also discussed.
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