摘要
利用透射电子显微术研究了离子氮碳共渗层显微组织。结果表明：ε相可以｛１１１｝＿γ’为基且以＜１１０＞＿γ’为轴互成１８０°旋转孪晶生长。发现存在一种与通常密堆六角孪晶系统不同的ε相生长孪晶。γ’相多以互成１８０°旋转孪晶形式存在于化合物层中，其旋转轴为＜１１１＞＿γ’。扩散层中α”相存在两种衍衬效应：即α”相衬度及相界的应变场衬度。
Microstructure of ion-nitrocarburizing layer has been studied by TEM.The results show that the εphases can grow in 180° turning twins each other based on {111}_γ' through < 111>_γ'. There is a kind of ε growing twin With different twin system from that of the normal hcp structure. A lot of γ' phases are in th compound in the way of the 180°turning twin each other. In diffusion layer,there are two different contrast of α' phases──α'phase contrast and strain field contrast of phase boundary.
关键词
显微组织
孪晶
应变场
碳氮共渗
ion nitrocarburizing,microstructure,twin,strain field
