Interfacial segregation and precipitation behavior of Cu-rich precipitates in Cu-bearing 316LN stainless steel after aging at different temperatures

doi:10.1016/j.msea.2020.140571

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	Interfacial segregation and precipitation behavior of Cu-rich precipitates in Cu-bearing 316LN stainless steel after aging at different temperatures
	Xi, Tong 2; Zhang, Xinrui 1,2; Yin, Xueliang 3; Yang, Chunguang 2; Yang, Ke 2
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2021-02-23
卷号	805 页码:8
关键词	Copper precipitation Mechanical property 316LN stainless Steel Interfacial segregation Atom probe tomography
ISSN号	0921-5093
DOI	10.1016/j.msea.2020.140571
通讯作者	Yang, Chunguang(cgyang@imr.ac.cn)
英文摘要	Interfacial segregation and precipitation behavior of Cu-rich precipitates in a Cu-bearing 316LN austenitic stainless steel (316LN-Cu SS) aged at 600, 700 and 800 degrees C were systematically investigated. The variations in morphology, composition of Cu-rich precipitates and interfacial segregation were characterized by transmission electron microscopy (TEM), atom probe tomography (APT) and Gibbsian interfacial excess. Experimental results revealed the Cu-rich precipitates led to increase in hardness and strength of steel. The 316LN-Cu SS aged at 700 degrees C for 6 h possessed the optimal strength and elongation due to the proper size, number density and volume fraction of the Cu-rich precipitates in the steel matrix. The average size of Cu-rich precipitates significantly increased from 0.85 +/- 0.14 nm to 5.21 +/- 1.51 nm with increasing the aging temperature, while the coherent relationship between Cu-rich precipitates and gamma-Fe matrix remained unaltered even for large size Cu-rich precipitate. The APT analysis confirmed that the composition of Cu-rich precipitate was enriched in Cu atoms and depleted of other elements with increasing aging temperature, while their core composition became nearly pure Cu at high aging temperatures. In addition, due to strong bonding energy, Ni was significantly segregated at the gamma-Fe matrix/precipitate heterophase interface, with Gibbsian interfacial excesses related to Fe and Cu of 0.6036 +/- 0.52, 2.892 +/- 0.55 and 2.908 +/- 0.38 atoms nm(-2) after aging at 600, 700 and 800 degrees C, respectively. This interface segregation further caused the reductions in interfacial free energies up to 7.28, 38.9 and 43.1 mJ m(-2), respectively.
资助项目	National Key Research and Development Program of China[2016YFB0300205] ; National Natural Science Foundation of China[51771199] ; State Key Program of National Natural Science of China[51631009] ; Youth Innovation Promotion Association CAS[2018221] ; Foundation of Liaoning Educational Committee of China[L2019lkyjc-03]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000620165600002
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China ; State Key Program of National Natural Science of China ; Youth Innovation Promotion Association CAS ; Foundation of Liaoning Educational Committee of China
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/160483]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yang, Chunguang
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 3.Liaoning Inst Sci & Technol, Sch Met, Benxi 117000, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Xi, Tong,Zhang, Xinrui,Yin, Xueliang,et al. Interfacial segregation and precipitation behavior of Cu-rich precipitates in Cu-bearing 316LN stainless steel after aging at different temperatures[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2021,805:8.
APA	Xi, Tong,Zhang, Xinrui,Yin, Xueliang,Yang, Chunguang,&Yang, Ke.(2021).Interfacial segregation and precipitation behavior of Cu-rich precipitates in Cu-bearing 316LN stainless steel after aging at different temperatures.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,805,8.
MLA	Xi, Tong,et al."Interfacial segregation and precipitation behavior of Cu-rich precipitates in Cu-bearing 316LN stainless steel after aging at different temperatures".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 805(2021):8.