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

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	Microstructural evolution and mechanical properties of solution annealed cast IN617B alloy during long-term thermal exposure
	Gao, Shuang; Hou, Jieshan; Guo, Yongan; Zhou, Lanzhang; Hou, JS; Zhou, LZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
刊名	ELSEVIER SCIENCE SA
	2017-09-17
卷号	704 页码:302-310
关键词	In617b Alloy M23c6 Carbides Gamma' Precipitation Behavior Thermal Exposure
ISSN号	0921-5093
英文摘要	Cast IN617B alloy, a nickel-based superalloy, is considered as a preferential candidate for castings or valve components in developing 700 degrees C 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 degrees C are systematically investigated. The results show that Ti (C, N), M6C and M23C6 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 M23C6, M6C and gamma' 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 M23C6 carbides within grains. Moreover, the microstructure observation reveals that the growth of M23C6 facilitates the formation of gamma' by enriching gamma'-formation elements, and conversely, dense gamma' phase inhibites the coarsening and transformation of M23C6 by constraining the diffusion of M23C6-formation elements. The tensile strength of 700 C improves strikingly due to the precipitation strengthening of gamma' 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.; Cast IN617B alloy, a nickel-based superalloy, is considered as a preferential candidate for castings or valve components in developing 700 degrees C 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 degrees C are systematically investigated. The results show that Ti (C, N), M6C and M23C6 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 M23C6, M6C and gamma' 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 M23C6 carbides within grains. Moreover, the microstructure observation reveals that the growth of M23C6 facilitates the formation of gamma' by enriching gamma'-formation elements, and conversely, dense gamma' phase inhibites the coarsening and transformation of M23C6 by constraining the diffusion of M23C6-formation elements. The tensile strength of 700 C improves strikingly due to the precipitation strengthening of gamma' 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.
学科主题	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
语种	英语
资助机构	National Energy Administration Program of China [NY 20150102]; NSFC (National natural Science Foundation of China) [51571191]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79093]
专题	金属研究所_中国科学院金属研究所
通讯作者	Hou, JS; Zhou, LZ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Gao, Shuang,Hou, Jieshan,Guo, Yongan,et al. Microstructural evolution and mechanical properties of solution annealed cast IN617B alloy during long-term thermal exposure[J]. ELSEVIER SCIENCE SA,2017,704:302-310.
APA	Gao, Shuang,Hou, Jieshan,Guo, Yongan,Zhou, Lanzhang,Hou, JS,&Zhou, LZ .(2017).Microstructural evolution and mechanical properties of solution annealed cast IN617B alloy during long-term thermal exposure.ELSEVIER SCIENCE SA,704,302-310.
MLA	Gao, Shuang,et al."Microstructural evolution and mechanical properties of solution annealed cast IN617B alloy during long-term thermal exposure".ELSEVIER SCIENCE SA 704(2017):302-310.