Microstructure and mechanical properties evolutions of 9Cr heat resistant steel deposited metals with different Si contents during 550 &deg;C aging process

doi:10.1016/j.jmrt.2023.08.042

IMR OpenIR

	Microstructure and mechanical properties evolutions of 9Cr heat resistant steel deposited metals with different Si contents during 550 °C aging process
	Yu, Tongtong 1,2,3; Liu, Chen 1,2,3; Wu, Dong 1,3; Wei, Shitong 1,3; Lu, Shanping 1,3
通讯作者	Wei, Shitong(stwei@imr.ac.cn) ; Lu, Shanping(shplu@imr.ac.cn)
	2023-09-01
发表期刊	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
ISSN	2238-7854
卷号	26 页码:2122-2139
摘要	The stability of microstructure and mechanical properties of 9Cr heat resistant steel under high temperature and long term service conditions has been a hot issue of great interest. In the present study, the relationships between microstructure and mechanical properties evolutions of 9Cr heat resistant deposited metals with different Si contents (0.25 wt.% and 1.07 wt.%) at 550 degrees C aging for different times were investigated systematically. The results indicate that the degradation of mechanical properties during aging is mainly attributed to the coarsening of precipitates, transformation of precipitate types, decreasing of dislocation density and coarsening of martensite laths, and these factors are related to the Si content in the deposited metals and the aging time. It is worth mentioned that the subgrain boundaries pinned by M23C6 forming after post weld heat treatment (750 degrees C/2.5 h) stabilize the tensile strength during aging. The recrystallization occurring after post weld heat treatment and high temperature aging is beneficial for the impact toughness but not for the strength. During aging process, the precipitate transformation follows the following sequence: M23C6 -> M6X -> Laves phase. Moreover, the increase of Si content promotes the nucleation and coarsening of M6X, and then deteriorates the mechanical properties of the deposited metals. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
关键词	Silicon content Tensile strength Impact toughness High temperature aging Post weld heat treatment Deposited metal
资助者	LingChuang Research Project of China National Nuclear Corporation, National Key Research and Development Program of China ; China Institute of Atomic Energy
DOI	10.1016/j.jmrt.2023.08.042
收录类别	SCI
语种	英语
资助项目	LingChuang Research Project of China National Nuclear Corporation, National Key Research and Development Program of China[2018YFA0702902] ; China Institute of Atomic Energy[E141L803J1]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001072582900001
出版者	ELSEVIER
引用统计	被引频次：6[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/321006/179407
专题	中国科学院金属研究所
通讯作者	Wei, Shitong; Lu, Shanping
作者单位	1.Chinese Acad Sci, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China
推荐引用方式 GB/T 7714	Yu, Tongtong,Liu, Chen,Wu, Dong,et al. Microstructure and mechanical properties evolutions of 9Cr heat resistant steel deposited metals with different Si contents during 550 °C aging process[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2023,26:2122-2139.
APA	Yu, Tongtong,Liu, Chen,Wu, Dong,Wei, Shitong,&Lu, Shanping.(2023).Microstructure and mechanical properties evolutions of 9Cr heat resistant steel deposited metals with different Si contents during 550 °C aging process.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,26,2122-2139.
MLA	Yu, Tongtong,et al."Microstructure and mechanical properties evolutions of 9Cr heat resistant steel deposited metals with different Si contents during 550 °C aging process".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 26(2023):2122-2139.