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采用金相、SEM和XRD等方法,对原始及不同服役阶段的F12马氏体耐热钢试样的性能和组织结构进行了分析和比较.结果表明:随着服役时间的延长,试样的力学性能明显下降;在不同服役阶段,F12马氏体耐热钢试样的显微结构发生了明显变化,不仅出现原奥氏体晶界处碳化物的粗化、基体组织中α-Fe的晶格常数减小,且断裂态马氏体组织完全分解,并在晶界粗化的碳化物处形成蠕变孔洞.马氏体组织分解、碳化物粗化和基体组织合金元素贫化是直接导致材料性能下降的原因.
The properties and microstructure of F12 martensite heat-resistant steel samples in the original and different service stages were analyzed and compared by means of metallography, SEM and XRD.The results showed that with the extension of service time, The microstructure of F12 martensite heat-resisting steel changed obviously at different service stages, not only the coarsening of carbides in the original austenite grain boundaries, but also the α-Fe The lattice constant is reduced and the martensite in the fracture state is completely decomposed and creep pores are formed in the carbides where the grain boundary coarsens.The martensitic structure is decomposed and the carbides are roughed and the matrix and alloying elements are depleted directly Cause material properties decline.