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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
Transmission electron microscopy was used to observe the eutectoid cementites in several high carbon and low alloy steels and found that the cementite sheets were not uniform. There were some ferrite sublayers with the same orientation and width in the eutectoid cementite Layer, these ferrite sub-sheet can be sheet eutectoid cementite ferrite cut off the plane where the index is {211} F is more.This article also analyzed and compared the common fringe contrast with the ferrite The difference between the body sublayers and the formation mechanism of ferrite sublayers in eutectoid cementite are discussed