Microstructure evolution and impact toughness degradation of a 3.6%Si austenitic stainless steel during high-temperature exposure

doi:10.1016/j.msea.2024.147063

IMR OpenIR

	Microstructure evolution and impact toughness degradation of a 3.6%Si austenitic stainless steel during high-temperature exposure
	Su, Yuanfei 1,2,3; Shi, Xianbo 1,3; Zhang, Shuzhan 1,2,3; Jiao, Shengxuan 1,2,3; Yan, Wei 1,3; Rong, Lijian 1,3
通讯作者	Yan, Wei(weiyan@imr.ac.cn) ; Rong, Lijian(ljrong@imr.ac.cn)
	2024-10-01
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	913 页码:17
摘要	Si-modified Fe-Cr-Ni austenitic stainless steel is a promising candidate structural material in lead-cooled fast reactor systems and high-temperature microstructural stability is the challenge for developing this kind of materials. In the present research, the microstructure and corresponding impact toughness evolutions of a 3.6 wt%Si austenitic stainless steel (3.6Si-ASS) aged between 510 and 650 degrees C up to 5000 h were investigated. It was found that the microstructure showed nearly no change within 2000 hat 510 degrees C. Subsequently, the G-phase (Cr3Ni2Si) 3 Ni 2 Si) began to form at grain boundaries after 3000 h. This made the matrix near grain boundaries Ni-depleted and promoted the formation of ferrite. Finally, a mixed microstructure consisting of G-phase and ferrite was formed after 5000 h. The appearance of ferrite caused a slight decrease in impact toughness. This evolution was further accelerated during aging at 550 degrees C, and the impact toughness showed a significant decrease when ferrite appeared. Interestingly, the G-phase and ferrite were suppressed, replaced by intergranular M6C 6 C ((Cr, Mo)3Ni2SiC) 3 Ni 2 SiC) carbide and intragranular (Cr, Si, Mo)-rich chi-phase during aging at 600 and 650 degrees C. Herein, M6C 6 C carbides preferred to form at grain boundaries, making intergranular cracking easier and reducing the toughness. When aged at 650 degrees C, the higher diffusion rates of Cr, Ni, Si and Mo increase grain boundaries coverage of M6C 6 C and also the number density, diameter, and area fraction of the chi-phase.
关键词	Si-modified austenitic stainless steel Thermal aging Microstructure evolution Impact toughness
资助者	LingChuang Research Project of China National Nuclear Corporation ; Natural Science Foundation of Liaoning Province
DOI	10.1016/j.msea.2024.147063
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[2023-MS-019]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001293290600001
出版者	ELSEVIER SCIENCE SA
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/189041
专题	中国科学院金属研究所
通讯作者	Yan, Wei; Rong, Lijian
作者单位	1.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shi Changxu Innovat Ctr Adv Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Su, Yuanfei,Shi, Xianbo,Zhang, Shuzhan,et al. Microstructure evolution and impact toughness degradation of a 3.6%Si austenitic stainless steel during high-temperature exposure[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2024,913:17.
APA	Su, Yuanfei,Shi, Xianbo,Zhang, Shuzhan,Jiao, Shengxuan,Yan, Wei,&Rong, Lijian.(2024).Microstructure evolution and impact toughness degradation of a 3.6%Si austenitic stainless steel during high-temperature exposure.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,913,17.
MLA	Su, Yuanfei,et al."Microstructure evolution and impact toughness degradation of a 3.6%Si austenitic stainless steel during high-temperature exposure".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 913(2024):17.