Effects of nitrogen on precipitation and tensile behaviors of 25Cr-20Ni austenitic stainless steels at elevated temperatures

doi:10.1016/j.msea.2019.03.004

IMR OpenIR

	Effects of nitrogen on precipitation and tensile behaviors of 25Cr-20Ni austenitic stainless steels at elevated temperatures
	Hu, Guodong 1,2; Wang, Pei 1,2; Li, Dianzhong 1,2; Li, Yiyi 1,2
通讯作者	Wang, Pei(pwang@imr.ac.cn)
	2019-04-03
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	752 页码:93-100
摘要	To understand the effects of nitrogen on precipitation and tensile behaviors at elevated temperatures, 25Cr-20Ni austenitic stainless steels with different nitrogen contents (0.065 wt %, 0.13 wt % and 0.17 wt %) were tensioned from room temperature to 1000 degrees C. Results show that the elongation and area reduction change differently with temperature increasing from 800 degrees C to 1000 degrees C, which are caused by different fracture modes. The necking concentrates in a small zone in the tensile samples of 0.17 wt % N steel, while the necking deformation occurs in all gauge length in specimens of other two steels. The local necking in 0.17 wt % N steel is induced by the enhanced recrystallization softening effect during tensile deformation. As the dislocation recovery are retarded by more solute nitrogen atoms and nitrides in 0.17 wt % N steel, the dislocation density difference between deformed grains and recrystallized grains turns larger, which results in a higher recrystallization rate and enhanced softening effect in further deformation. Additionally, the content of M23C6 precipitates unexpectedly increases with the increasing nitrogen after tensile test at 800 degrees C. This is because the increasing nitrogen promotes the formation of NbCrN in higher nitrogen steels during solution heat treatment, instead of Nb(C, N) in lower nitrogen steels. The precipitation of NbCrN releases carbon into austenitic matrix, leading to the acceleration of M23C6 precipitation during tensile test at 800 degrees C.
关键词	Austenitic stainless steel Nitrogen High-temperature tensile property Precipitate Fracture mode
资助者	Youth Innovation Promotion Association, Chinese Academy of Sciences
DOI	10.1016/j.msea.2019.03.004
收录类别	SCI
语种	英语
资助项目	Youth Innovation Promotion Association, Chinese Academy of Sciences[2013126]
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:000464088200011
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：15[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/321006/132987
专题	中国科学院金属研究所
通讯作者	Wang, Pei
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, 72 Wenhua Rd, Shenyang 110016, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Hu, Guodong,Wang, Pei,Li, Dianzhong,et al. Effects of nitrogen on precipitation and tensile behaviors of 25Cr-20Ni austenitic stainless steels at elevated temperatures[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2019,752:93-100.
APA	Hu, Guodong,Wang, Pei,Li, Dianzhong,&Li, Yiyi.(2019).Effects of nitrogen on precipitation and tensile behaviors of 25Cr-20Ni austenitic stainless steels at elevated temperatures.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,752,93-100.
MLA	Hu, Guodong,et al."Effects of nitrogen on precipitation and tensile behaviors of 25Cr-20Ni austenitic stainless steels at elevated temperatures".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 752(2019):93-100.