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Microstructural evolution and mechanical properties of solution annealed cast IN617B alloy during long-term thermal exposure

机译：长期热暴露下固溶退火IN617B合金的组织演变和力学性能

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摘要

Cast IN617B alloy, a nickel-based superalloy, is considered as a preferential candidate for castings or valve components in developing 700 ℃ Advanced Ultra Supercritical (A-USC) power plant. Microstructural evolution and mechanical properties of solution annealed cast IN617B alloy during the long-term thermal exposure at 700 ℃ are systematically investigated. The results show that Ti (C, N), M_6C and M_(23)C_6 are the primary precipitates in as-cast microstructure, and most of them completely dissolved after solution heat treatment. The major precipitates in the thermal exposed microstructure are M_(23)C_6, M_6C and γ' phases, and a trace amount of a phases are also detected within grains. By comparison with previous studies on wrought IN617B alloy, it is identified that the processing method exerts a significant influence on the morphology of M_923)C_6 carbides within grains. Moreover, the microstructure observation reveals that the growth of M_(23)C_6 facilitates the formation of γ' by enriching Y'-formation elements, and conversely, dense y' phase inhibites the coarsening and transformation of M_(23)C_6 by constraining the diffusion of M_(23)C_6-formation elements. The tensile strength of 700 ℃ improves strikingly due to the precipitation strengthening of γ' phases and carbides while the ductility decreases noticeably. The significant coarsening of carbides on grain boundaries (GBs) results in the fracture mechanism evolution during long-term thermal exposure.
机译：镍基超合金铸造IN617B合金被认为是发展中的700℃先进超超临界（A-USC）电厂的铸件或阀门组件的优先选择。系统地研究了固溶退火的IN617B合金在700℃长期热暴露下的组织演变和力学性能。结果表明，Ti（C，N），M_6C和M_（23）C_6是铸态组织中的主要析出物，固溶热处理后它们大部分完全溶解。热暴露的显微组织中的主要沉淀物是M_（23）C_6，M_6C和γ'相，并且在晶粒内也检测到痕量的相。通过与先前对变形IN617B合金的研究相比较，可以确定该加工方法对晶粒内M_923）C_6碳化物的形貌产生了重大影响。此外，显微组织观察表明，M_（23）C_6的生长通过富集Y'-形成元素促进了γ'的形成，反之，致密的y'相通过限制M_（23）C_6的粗化和转变而抑制了M_（23）C_6-形成元素的扩散。 γ'相和碳化物的析出强化使700℃的拉伸强度显着提高，而延展性明显降低。碳化物在晶界（GBs）上的显着粗化会导致长期热暴露过程中断裂机理的演变。

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