Absence of dynamic strain aging induced by precipitation in 316 austenitic stainless steel during thermal aging at 750 °C

doi:10.1016/j.matchar.2023.113580

IMR OpenIR

	Absence of dynamic strain aging induced by precipitation in 316 austenitic stainless steel during thermal aging at 750 °C
	Lv, Xinliang 1,2; Chen, Shenghu 1; Rong, Lijian 1
通讯作者	Chen, Shenghu(chensh@imr.ac.cn) ; Rong, Lijian(ljrong@imr.ac.cn)
	2024
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	207 页码:10
摘要	Dynamic strain aging (DSA) has long been seen in the solution-treated austenitic stainless steels, but DSA effect is affected after long-term exposure to high temperature in the fourth-generation nuclear reactors. This study investigated the effect of precipitates on the DSA effect of 316 austenitic stainless steel after accelerated aging at 750 degrees C for 10, 100 and 1000 h, which is used to simulate the long-term microstructural evolution at service temperature. A gradual reduction in the DSA effect is found with an increase in the grain boundary precipitates after aging for 10 and 100 h. The frequency of the interactions between dislocations and grain boundaries de-creases because moving dislocations are blocked by the precipitates formed at the grain boundaries. Meanwhile, the grain boundary precipitates occupy part of the grain boundaries, reducing the probability of dislocation emission from grain boundary. As the aging time prolongs to 1000 h, the newly-formed intragranular sigma phase acts as an obstacle to the dislocation movement, resulting in an increase in waiting time (tw-AG1000). Also, Cr atoms can be drained from mobile dislocation into sigma phase, leading to an increase in the aging time (ta-AG1000) required for pinning the arrested dislocations. As a result, the critical strain for the occurrence of DSA signifi-cantly increases, leading to the absence of DSA phenomenon.
关键词	Austenitic stainless steel Dynamic strain aging Accelerated aging treatment Precipitation Microstructural evolution
资助者	National Natural Science Foundation of China ; Youth Innovation Promotion Association, CAS ; LingChuang Research Project of China National Nuclear Corporation ; CNNC Science Fund for Talented Young Scholars
DOI	10.1016/j.matchar.2023.113580
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51871218] ; Youth Innovation Promotion Association, CAS[2018227] ; LingChuang Research Project of China National Nuclear Corporation ; CNNC Science Fund for Talented Young Scholars
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:001141336500001
出版者	ELSEVIER SCIENCE INC
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/183632
专题	中国科学院金属研究所
通讯作者	Chen, Shenghu; Rong, Lijian
作者单位	1.Chinese Acad Sci, Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Lv, Xinliang,Chen, Shenghu,Rong, Lijian. Absence of dynamic strain aging induced by precipitation in 316 austenitic stainless steel during thermal aging at 750 °C[J]. MATERIALS CHARACTERIZATION,2024,207:10.
APA	Lv, Xinliang,Chen, Shenghu,&Rong, Lijian.(2024).Absence of dynamic strain aging induced by precipitation in 316 austenitic stainless steel during thermal aging at 750 °C.MATERIALS CHARACTERIZATION,207,10.
MLA	Lv, Xinliang,et al."Absence of dynamic strain aging induced by precipitation in 316 austenitic stainless steel during thermal aging at 750 °C".MATERIALS CHARACTERIZATION 207(2024):10.