用金相法、电镜观察等分析研究了固溶+时效处理过程中18Cr18Mn2MoN高氮奥氏体不锈钢氮(碳)化物及金属间相的析出行为。结果表明，在18Cr18Mn2MoN不锈钢中，随900 ℃等温时间的延长，Cr2N析出过程为：沿晶界以链条状析出→沿三晶界交汇处以胞状析出并伴随少量的晶内析出→逐渐向晶内生长并与晶内析出物相连呈层片状布满整个晶面；随着氮化物的析出伴随有σ、χ和γ′相析出。探讨了各析出物的析出机理，通过析出物形貌的TEM观察和选区衍射分析（SAD）确定了几种析出物的晶体结构及其与基体的位向关系。
The precipitation of nitrides(carbides) in solution treatment and aging process of 18Cr18Mn2MoN high nitrogen austenitic stainless steel was investigated by use of metallographic and electron microscopical analysis. The results show that precipitation process of Cr2N is divided in three steps:first, precipitation of chainlike Cr2N along grain boundaries;Second,precipitation of cellular Cr2N at meeting point of three intergranulars and a small amount of Cr2N precipitated in transgranularly;third, Cr2N precipitates grow from grain boundaries into grain gradually and are connected with trans granular Cr2N forming tablets and cover whole grain.with nitrides precipitation,σ,x and γ′ phases are formed.The precipitation mechanism is discussed.The crystalline structure of precipitates and orientation relationship between precipitates and matrix were studied with transmission electron microscopy(TEM) and selected area electron diffraction(SAD).
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