Microstructural evolution and its influence on the impact toughness of GH984G alloy during long-term thermal exposure

doi:10.1016/j.jmst.2020.06.005

IMR OpenIR

	Microstructural evolution and its influence on the impact toughness of GH984G alloy during long-term thermal exposure
	Wu, Yunsheng 1,2; Qin, Xuezhi 1; Wang, Changshuai 1; Zhou, Lanzhang 1
通讯作者	Zhou, Lanzhang(lzz@imr.ac.cn)
	2021-01-10
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	60 页码:61-69
摘要	The microstructure evolution and its effect on the impact toughness of a new Ni-Fe based alloy GH984G, used in 700 degrees C ultra-super critical coal-fired power plant, were investigated during thermal exposure at 650 degrees C-750 degrees C for up to 10,000 h. The results show that the impact toughness at room temperature drops rapidly at the early stage during thermal exposure at 700 degrees C and then has no significant change even if after exposure for 10,000 h. The significant decline of the impact toughness is attributed to the coarsening of M23C6 carbides at grain boundaries, which weakens the grain boundary strength and leads to the aging-induced grain boundary embrittlement. The M23C6 carbides have almost no change with further thermal exposure and the impact toughness also remains stable. Additionally, the impact toughness rises with the increase of thermal exposure temperature. The size of gamma' after thermal exposure at 750 degrees C for 10,000 his much bigger than that at 650 degrees C and 700 degrees C for 10,000 h. Therefore, the intragranular strength decreases significantly due to the transformation of the interaction between gamma' and dislocation from strongly coupled dislocation shearing to Orowan bowing. More plastic deformation occurs within grains after thermal exposure at 750 degrees C for 10,000 h, which increases the impact toughness. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Ni-Fe based alloy GH984G Long-term thermal exposure Microstructure evolution Impact toughness
资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; LiaoNing Revitalization Talents Program
DOI	10.1016/j.jmst.2020.06.005
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2017YFB0305204] ; National Natural Science Foundation of China[51971216] ; National Natural Science Foundation of China[51871213] ; LiaoNing Revitalization Talents Program[XLYC1807038]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000594138800008
出版者	JOURNAL MATER SCI TECHNOL
引用统计	被引频次：36[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/158714
专题	中国科学院金属研究所
通讯作者	Zhou, Lanzhang
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Wu, Yunsheng,Qin, Xuezhi,Wang, Changshuai,et al. Microstructural evolution and its influence on the impact toughness of GH984G alloy during long-term thermal exposure[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,60:61-69.
APA	Wu, Yunsheng,Qin, Xuezhi,Wang, Changshuai,&Zhou, Lanzhang.(2021).Microstructural evolution and its influence on the impact toughness of GH984G alloy during long-term thermal exposure.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,60,61-69.
MLA	Wu, Yunsheng,et al."Microstructural evolution and its influence on the impact toughness of GH984G alloy during long-term thermal exposure".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 60(2021):61-69.