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作者用光学显微镜和扫描电镜研究了奥氏体氮碳共渗的渗层组织。根据 Fe-N-C 三元相图讨论了渗层的组成。观察了化合物层的淬火时效现象、化合物层的柱状晶结构和表面疏松以及奥氏体淬火层在回火时的组织转变。在实验中发现;渗层内残余奥氏体的分解始于奥氏体层与化合物层的界面附近,分解产物的核心数目很多而核心的长大则相当缓慢,分解产物的形貌既不同于回火马氏体也不同于一般的贝氏体。奥氏体层中的马氏体片在回火过程中增宽。渗碳体在奥氏体层中的分布很不均匀。
The authors studied the microstructure of nitrided nitrided infiltrated layers by optical microscopy and scanning electron microscopy. According to Fe-N-C ternary phase diagram of the composition of the infiltration layer. The quench aging of the compound layer, the columnar crystal structure and surface porosity of the compound layer, and the microstructure transformation of the austenite-quenched layer upon tempering were observed. It is found in the experiment that the decomposition of residual austenite in the infiltration layer starts near the interface between the austenite layer and the compound layer. The number of the core of the decomposition product is very large and the core growth is rather slow. The morphology of the decomposition product is different Tempering martensite is also different from the normal bainite. The martensite sheet in the austenite layer broadens during tempering. The distribution of cementite in the austenite layer is very uneven.