使用电子显微镜研究了５５０℃，６ｈ离子渗氮的３５ＣｒＭｏ钢渗层的组织形貌和界面结构．结果表明，渗层外层为分层相间分布的ε＋γ′条带状组织。在化合物内层的γ′相中有空位盘、位错、层错四面体和孪晶．ε相和γ′相之间的界面光滑且平直．除了观察到一个原子层结构台阶，也发现多个原子层高度的结构台阶．大量晶体缺陷的存在是加速离子渗氮过程的主要原因。
The morphologies and the interface structures of ion-nitrided layers, which were obtained by ion nitriding of 35CrMo steel at 550 ℃ for 6 h, were studied with JEM-H800 TEM and JEM 2000 EX II HRTEM. The results show that the structures of theouter layer of ion-nitriding are s (Fe_2-3N)-phase and γ′(Fe_4N)-phase, which are arranged in alternating, ribbon-like strips. There are many various crystal defects, such as vacancies, dislocations,stacking faults,and twins in the internal layer compound——the γ′- phase. The interfaces between ε-phase and γ′ -phase are smooth and straight. Ledges of monoatom layers and multiatom layers were found. The existance of a number of crystal defects is the main reason why ion bombing accelerates the nitriding process.
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