Microstructure and Local Properties of a Domestic Safe-End Dissimilar Metal Weld Joint by Using Hot-Wire GTAW

doi:10.11900/0412.1961.2016.00135

IMR OpenIR

	Microstructure and Local Properties of a Domestic Safe-End Dissimilar Metal Weld Joint by Using Hot-Wire GTAW
	Ming Hongliang 1,2; Zhang Zhiming 1; Wang Jianqiu 1; Han En-Hou 1; Su Mingxing 3
通讯作者	Wang Jianqiu(wangjianqiu@imr.ac.cn)
	2017
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	53 期号:1 页码:57-69
摘要	Dissimilar metal weld joints (DMWJ) widely exist in the nuclear power plants to join the different parts which are made of different structural materials. Among these DMWJs, safe-end DMWJ has attracted much attention of researchers and operating enterprises, as premature failures, mainly stress corrosion cracking failures, have occurred in these kinds of joints. However, DMWJ with 52M as filler metal in the nuclear power plants has no in-service experience. To ensure the structural integrity of the weld joint and the safe operation of the future plants, the microstructure and local properties of a domestic safe-end DMWJ by using hot-wire gas tungsten arc welding (GTAW) technology was studied in detail by OM, SEM, micro-hardness testing, local mechanical tensile testing and slow strain rate tests. The tensile tests were performed at room temperature with the tensile speed of 5 mu m/s while the slow strain rate tests were conducted in simulated primary water containing 1500 mg/L B as H3BO3 and 2.3 mg/L Li as LiOH with 2 mg/L dissolved oxygen at 325 degrees C. A large amount of type I boundaries and type II boundaries which are susceptible to stress corrosion cracking (SCC) exist in 52Mb near the SA508/52Mb interface and result in the highest SCC susceptibility of this interface. Microstructure transition was found in the SA508 heat affected zone (HAZ). In 316LN HAZ, increasing the distance from the fusion boundary, the number fraction of CSL boundaries increase while the residual strain decreases, resulting in the second-highest SCC susceptibility of 316LN HAZ. In 52M, residual strain distributes randomly but not uniformly, the residual strain is prone to accumulate at the grain boundaries. Dramatic changes of mechanical properties are observed across the joint, especially at the SA508/52M interface. The differences of the local microstructure and chemical composition lead to the differences of the local properties of the weld joint.
关键词	dissimilar metal weld joint microstructure local mechanical property stress corrosion cracking susceptibility residual strain
资助者	National Natural Science Foundation of China ; Science and Technology Commission of Shanghai Municipality ; Key Research Program of Frontier Sciences, CAS
DOI	10.11900/0412.1961.2016.00135
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[51301183] ; Science and Technology Commission of Shanghai Municipality[14DZ2250300] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-JSC012]
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000393446900007
出版者	SCIENCE PRESS
引用统计	被引频次：17[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/321006/123806
专题	中国科学院金属研究所
通讯作者	Wang Jianqiu
作者单位	1.Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Liaoning Key Lab Safety & Assessment Tech Nucl Ma, Shenyang 110016, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Shanghai Res Ctr Weld & Detect Engn Tech Nucl Equ, Shanghai 201306, Peoples R China
推荐引用方式 GB/T 7714	Ming Hongliang,Zhang Zhiming,Wang Jianqiu,et al. Microstructure and Local Properties of a Domestic Safe-End Dissimilar Metal Weld Joint by Using Hot-Wire GTAW[J]. ACTA METALLURGICA SINICA,2017,53(1):57-69.
APA	Ming Hongliang,Zhang Zhiming,Wang Jianqiu,Han En-Hou,&Su Mingxing.(2017).Microstructure and Local Properties of a Domestic Safe-End Dissimilar Metal Weld Joint by Using Hot-Wire GTAW.ACTA METALLURGICA SINICA,53(1),57-69.
MLA	Ming Hongliang,et al."Microstructure and Local Properties of a Domestic Safe-End Dissimilar Metal Weld Joint by Using Hot-Wire GTAW".ACTA METALLURGICA SINICA 53.1(2017):57-69.