Tailoring microstructure and mechanical performance of the graphite-Ni based superalloy brazed combination used for molten salt reactors through thermal exposure

doi:10.1016/j.matchar.2019.109831

IMR OpenIR

	Tailoring microstructure and mechanical performance of the graphite-Ni based superalloy brazed combination used for molten salt reactors through thermal exposure
	He, Yanming 1; Lu, Chuanyang 1; Zheng, Wenjian 1; Yang, Jianguo 1; Wang, Donghong 2; Shen, Hanyang 1; Wang, Limei 1; Sun, Yuan 3; Gao, Zengliang 1
通讯作者	Zheng, Wenjian(zwj0322@zjut.edu.cn) ; Sun, Yuan(yuansun@imr.ac.cn)
	2019-10-01
发表期刊	MATERIALS CHARACTERIZATION
ISSN	1044-5803
卷号	156 页码:12
摘要	The work investigated the effect of high- and medium-temperature thermal exposure on the microstructure and mechanical performance of the graphite/Au/Hastelloy N alloy brazed joint. The microstructure in the joint was studied with the aid of scanning electron microscope coupled with transmission electron microscope analysis. The nano-indentation was used to probe the nano-scale elastic modulus and hardness of reaction phases in the joint. The joint bond strength was evaluated by a shear test. Results indicate that: three zones (zone 1, 2 and 3) were observed in the joint with the zone 1 close to graphite while the zone 3 adjacent to Hastelloy N alloy. The precipitates in each zone were characterized and their formation mechanism was proposed. High-temperature thermal exposure was performed at 1333 K for 1-90 min. A longer soaking time facilitated the carbon diffusion and then produced a hierarchical structure with a more smooth transition of coefficient of thermal expansion, being favorable for the enhancement of the joint strength. Among the soaking time under investigation, the highest joint bond strength obtained was 34.1 MPa. Medium-temperature thermal exposure was carried out at 873-1073 K for 240 h. A high-quality joint was maintained when the joint was aged below 973 K. Over 973 K, a valid bonding was not achieved at the graphite/filler interface due to the precipitation of extensive carbon segregation in the zone 1 of the joint. The work performed will provide basic design principle for the graphite/Hastelloy N alloy brazed combinations used in molten salt reactors.
关键词	Graphite/Ni-based superalloy brazed combination Aging Transmission electron microscope Mechanical property
资助者	National Natural Science Foundation of China ; Natural Science Foundation of Zhejiang Province
DOI	10.1016/j.matchar.2019.109831
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51405439] ; National Natural Science Foundation of China[51705461] ; Natural Science Foundation of Zhejiang Province[LY17E050019] ; Natural Science Foundation of Zhejiang Province[LQ16E060004]
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:000487565900006
出版者	ELSEVIER SCIENCE INC
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/321006/135509
专题	中国科学院金属研究所
通讯作者	Zheng, Wenjian; Sun, Yuan
作者单位	1.Zhejiang Univ Technol, Inst Proc Equipment & Control Engn, Hangzhou 310014, Zhejiang, Peoples R China 2.Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Adv High Temp Mat & Precis Formi, Shanghai 200240, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Dept Superalloy, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	He, Yanming,Lu, Chuanyang,Zheng, Wenjian,et al. Tailoring microstructure and mechanical performance of the graphite-Ni based superalloy brazed combination used for molten salt reactors through thermal exposure[J]. MATERIALS CHARACTERIZATION,2019,156:12.
APA	He, Yanming.,Lu, Chuanyang.,Zheng, Wenjian.,Yang, Jianguo.,Wang, Donghong.,...&Gao, Zengliang.(2019).Tailoring microstructure and mechanical performance of the graphite-Ni based superalloy brazed combination used for molten salt reactors through thermal exposure.MATERIALS CHARACTERIZATION,156,12.
MLA	He, Yanming,et al."Tailoring microstructure and mechanical performance of the graphite-Ni based superalloy brazed combination used for molten salt reactors through thermal exposure".MATERIALS CHARACTERIZATION 156(2019):12.