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使用电子显微镜研究了 5 5 0℃ ,6h离子轰击渗氮的 3 5CrMo钢渗层的精细结构和界面结构 .结果表明 ,γ′(Fe4N)是等轴细晶粒组成的致密组织 .渗层外层为分层相间分布的ε(Fe2～ 3N) γ′(Fe4N )条带状组织 .γ′(Fe4N)相中有着丰富的空位、位错、孪晶、层错等缺陷 .γ′(Fe4N )相中的氮原子呈有序分布 .ε(Fe2～ 3N )和γ′(Fe4N )相间界面平直、共格 ,具有 ( 111) γ′∥ ( 0 0 0 1) ε,[110 ] γ′∥ [112 0 ] ε 取向关系 .除了观察到一个原子层的结构台阶 ,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轰击渗氮过程的主要原因 .
The microstructure and interfacial structure of 3 5CrMo steel infiltrated by ion bombardment at 550 ℃ and 6h were studied by means of electron microscopy. The results show that γ ’(Fe4N) is a dense structure composed of fine equiaxed grains. (Fe4N) γ ’(Fe4N) ribbon structure distributed in phase and in layers.The defects of vacancies, dislocations, twins and faults in γ’ (Fe4N) (111) γ’∥ (0 0 0 1) ε, [110] γ (γ) phase, and the nitrogen atoms in the phase are distributed orderly.The interface between ε (Fe2 ~ 3N) and γ ’(Fe4N) ∥ [112 0] ε orientation relationship.An addition to observing the structural step of an atomic layer, a number of structural steps of the atomic layer height are also found.The existence of a large number of crystal defects is the main reason for accelerated ion bombardment nitriding.