Microstructural and mechanical properties evolution for 9Cr-Si heat resistant steel deposited metals under different heat treatment states

doi:10.1016/j.matchar.2024.114430

IMR OpenIR

	Microstructural and mechanical properties evolution for 9Cr-Si heat resistant steel deposited metals under different heat treatment states
	Yu, Tongtong 1,2,3; Wei, Shitong 1,3; Lu, Shanping 1,3
通讯作者	Wei, Shitong(stwei@imr.ac.cn) ; Lu, Shanping(shplu@imr.ac.cn)
	2024-11-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	217 页码:12
摘要	To develop the matched filler metal for the structural materials in Generation IV lead-cooled fast reactor (LFR), the microstructural evolution and mechanical property variation of 9Cr-Si heat resistant steels deposited metals were investigated both for the as-welded and as-aged (at 550 degrees C) weld metals. The experimental results indicate two precipitates in the as-welded deposited metals: the bigger M23C6 and the smaller MX. Si facilitates the nucleation of M23C6. The chain-like precipitates (consisting of M23C6) form at the boundaries of prior austenite and martensitic laths in high-Si specimens. They deteriorate not only the strength but also the impact energy. Meanwhile, a few delta ferrites form in high-Si deposited metal deteriorating the impact energy. Precipitates tend to nucleate at the interface between the delta ferrite and the martensite after aging. New types of precipitates (Mo-rich M6X and Laves) with rapid coarsening rate form in as-aged high-Si deposited metals as time increases. Coarse precipitates deteriorate the pinning effect, which causes the recovery of laths and dislocations. Subgrain pinned by M23C6 forms in deposited metals with post-weld heat treatment (PWHT) during aging. The structure hinders the formation of M6X and facilitates the formation of nano-sized MX. Therefore, the mechanical properties of deposited metals with PWHT are stable during long-term (up to 10,000 h) aging treatments.
关键词	9Cr heat resistant steel Si content Mechanical properties delta ferrite
资助者	LingChuang Research Project of China National Nuclear Corporation ; Natural Science Foundation of Liaoning Province of China ; China Institute of Atomic Energy ; Natural Science Foundation of Heilongjiang Province
DOI	10.1016/j.matchar.2024.114430
收录类别	SCI
语种	英语
资助项目	LingChuang Research Project of China National Nuclear Corporation ; Natural Science Foundation of Liaoning Province of China[2022-MS-006] ; China Institute of Atomic Energy[E141L803J1] ; Natural Science Foundation of Heilongjiang Province[TD2021E006]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS记录号	WOS:001333238800001
出版者	ELSEVIER SCIENCE INC
引用统计	被引频次：1[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/321006/190625
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,Wei, Shitong,Lu, Shanping. Microstructural and mechanical properties evolution for 9Cr-Si heat resistant steel deposited metals under different heat treatment states[J]. MATERIALS CHARACTERIZATION,2024,217:12.
APA	Yu, Tongtong,Wei, Shitong,&Lu, Shanping.(2024).Microstructural and mechanical properties evolution for 9Cr-Si heat resistant steel deposited metals under different heat treatment states.MATERIALS CHARACTERIZATION,217,12.
MLA	Yu, Tongtong,et al."Microstructural and mechanical properties evolution for 9Cr-Si heat resistant steel deposited metals under different heat treatment states".MATERIALS CHARACTERIZATION 217(2024):12.