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Microstructural evolution and its influence on the impact toughness of GH984G alloy during long-term thermal exposure
Wu, Yunsheng1,2; Qin, Xuezhi1; Wang, Changshuai1; Zhou, Lanzhang1
Corresponding AuthorZhou, Lanzhang(lzz@imr.ac.cn)
2021-01-10
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume60Pages:61-69
AbstractThe 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.
KeywordNi-Fe based alloy GH984G Long-term thermal exposure Microstructure evolution Impact toughness
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China ; LiaoNing Revitalization Talents Program
DOI10.1016/j.jmst.2020.06.005
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000594138800008
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/158714
Collection中国科学院金属研究所
Corresponding AuthorZhou, Lanzhang
Affiliation1.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
Recommended Citation
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.
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