Effect of Aging Treatment at 700°C on Microstructure and Mechanical Properties of 9Cr ODS Steel

doi:10.11900/0412.1961.2022.00558

IMR OpenIR

	Effect of Aging Treatment at 700°C on Microstructure and Mechanical Properties of 9Cr ODS Steel
	Wang Jianqiang 1,2,3; Liu Weifeng 4; Liu Sheng 2,3; Xu Bin 2,3; Sun Mingyue 2,3; Li Dianzhong 3
通讯作者	Sun Mingyue(mysun@imr.ac.cn)
	2024-05-01
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	60 期号:5 页码:616-626
摘要	Compared to second- and third-generation nuclear power systems, the Generation IV fission and future fusion reactors have higher service temperatures and irradiation doses, as well as harsher corrosive conditions and complex alternating loads. The structural materials for advanced reactors need to be researched and developed further. The oxide dispersion strengthened (ODS) steel has excellent high-temperature performance and irradiation resistance and is considered a promising structural material for advanced nuclear power systems. To reveal the effect of aging on microstructure and mechanical properties of ODS steel at near-service temperatures, the evolution of carbide M23C6 and nano-oxide particles (NPs) as well as the changes in the mechanical properties of 9Cr ODS steel after aging at 700 degrees C for varying durations were studied using SEM, TEM, and tensile testing. M23C6 rapidly precipitated along grain boundaries, gradually aggregated, and grew during early aging (<= 200 h). While the NPs showed no noticeable change. During the midstages of aging (200 and 1000 h), NPs and carbides grew stably. In the later stages of aging (2000 and 3000 h), carbide particles grew to the micron scale. The average size and number density of the NPs tended to be stable. Compared to the initial 9Cr ODS steel, the growth rate of the average size was 19.7%, and the reduction rate of the number density was 27.1%. Dislocation cells and recovered subgrains appeared within some grains because of the pinning effect of NPs on continuous proliferation dislocations. The tensile strength rapidly decreased at the initial stages of aging. In the intermediate and later stages of aging, although the average size of the NPs increased and the number density decreased, its pinning effect was still prominent. Continuous proliferation dislocations were observed in the matrix, so the tensile strength remained stable. Furthermore, the tensile elongation was low during aging time of 1000 and 2000 h.
关键词	9Cr ODS steel aging carbide nano-oxide particle mechanical property
资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; IMR Innovation Foundation ; LingChuang Research Project of China National Nuclear Corporation ; Youth Innovation Promotion Association, CAS
DOI	10.11900/0412.1961.2022.00558
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2018YFA0702900] ; National Natural Science Foundation of China[52173305] ; National Natural Science Foundation of China[52101061] ; National Natural Science Foundation of China[52233017] ; National Natural Science Foundation of China[52203384] ; China Postdoctoral Science Foundation[2020M681004] ; China Postdoctoral Science Foundation[2021M703276] ; IMR Innovation Foundation[2022-PY12] ; LingChuang Research Project of China National Nuclear Corporation ; Youth Innovation Promotion Association, CAS
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001208805900004
出版者	SCIENCE PRESS
引用统计	被引频次：3[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/321006/185769
专题	中国科学院金属研究所
通讯作者	Sun Mingyue
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China 4.Beijing Inst Technol, Chongqing Innovat Ctr, Chongqing 401135, Peoples R China
推荐引用方式 GB/T 7714	Wang Jianqiang,Liu Weifeng,Liu Sheng,et al. Effect of Aging Treatment at 700°C on Microstructure and Mechanical Properties of 9Cr ODS Steel[J]. ACTA METALLURGICA SINICA,2024,60(5):616-626.
APA	Wang Jianqiang,Liu Weifeng,Liu Sheng,Xu Bin,Sun Mingyue,&Li Dianzhong.(2024).Effect of Aging Treatment at 700°C on Microstructure and Mechanical Properties of 9Cr ODS Steel.ACTA METALLURGICA SINICA,60(5),616-626.
MLA	Wang Jianqiang,et al."Effect of Aging Treatment at 700°C on Microstructure and Mechanical Properties of 9Cr ODS Steel".ACTA METALLURGICA SINICA 60.5(2024):616-626.