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

文献类型：期刊论文

作者Yu, Tongtong1,2,3; Liu, Chen1,2,3; Wu, Dong1,2; Wei, Shitong1,2; Lu, Shanping1,2
刊名JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
出版日期2023-09-01
卷号26页码:2122-2139
关键词Silicon content Tensile strength Impact toughness High temperature aging Post weld heat treatment Deposited metal
ISSN号2238-7854
DOI10.1016/j.jmrt.2023.08.042
通讯作者Wei, Shitong(stwei@imr.ac.cn) ; Lu, Shanping(shplu@imr.ac.cn)
英文摘要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/).
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
语种英语
WOS记录号WOS:001072582900001
出版者ELSEVIER
资助机构LingChuang Research Project of China National Nuclear Corporation, National Key Research and Development Program of China ; China Institute of Atomic Energy
源URL[http://ir.imr.ac.cn/handle/321006/179406]  
专题金属研究所_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.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang, Peoples R China
3.Univ Sci & Technol China, Sch Mat Sci & Engn, 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.

入库方式： OAI收割

来源：金属研究所

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