Multi-scale study of ductility-dip cracking in nickel-based alloy dissimilar metal weld

doi:10.1016/j.jmst.2018.10.023

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	Multi-scale study of ductility-dip cracking in nickel-based alloy dissimilar metal weld
	Li, Yifeng 2,3; Wang, Jianqiu 3; Han, En-Hou 3; Wu, Wenbo 2,3; Hanninen, Hannu 1
刊名	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
	2019-04-01
卷号	35 期号:4 页码:545-559
关键词	Dissimilar metal weld Nickel-base alloy Ductility-dip cracking (DDC) Slow strain rate tensile (SSRT) testing Thermal expansion coefficient
ISSN号	1005-0302
DOI	10.1016/j.jmst.2018.10.023
通讯作者	Wang, Jianqiu(wangjianqiu@imr.ac.cn)
英文摘要	A ductility-dip-cracking (DDC)-concentrated zone (DCZ) in a width of about 3 mm was observed adjacent to the AISI 316 L/52 Mw fusion boundary (FB) in 52Mw. The morphology, microstructure, mechanical and thermal properties and corrosion behavior in simulated primary water of DDC/DCZ were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), 3D X-ray tomography (XRT), 3D atom probe (3DAP), slow strain rate tensile (SSRT) testing and thermal dilatometry. The results indicate that DDCs are random-shaped and disc-like cavities with corrugated structure of inner surface and are parallel in groups along straight high-angle boundaries of columnar grains, ranging from micrometers to millimeters in size. Large-size M-23 C-6 carbides dominate on the grain boundaries rather than MC (M=Nb, Ti), and thus the bonding effect of carbides is absent for the straight grain boundaries. The impurity segregation of O is confirmed for the inner surfaces of DDC. The oxide film formed on the inner surface of DDC (about 50 nm) is approximately twice as thick as that on the matrix (about 25 nm) in simulated primary water. The yield strength, tensile strength and elongation to fracture of 52 MwDCZ (400 MPa, 450 MPa and 20 %, respectively) are lower than those of 52 Mw-MZ (460 MPa, 550 MPa and 28 %, respectively). The intrinsic high-restraint weld structure, the additional stress/strain caused by the thermal expansion difference between AISI 316 L and 52Mw as well as the detrimental carbide precipitation and the resulting grain boundary structure all add up to cause the occurrence of DCZ in the dissimilar metal weld. (C) 2019 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
资助项目	National Key Research and Development Program of China[2016YFE0105200] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences[QYZDY-SSW-JSC012]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	JOURNAL MATER SCI TECHNOL
WOS记录号	WOS:000455967200011
资助机构	National Key Research and Development Program of China ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/131376]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, Jianqiu
作者单位	1.Aalto Univ, Dept Mech Engn, POB 14200, Helsinki 00076, Finland 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Li, Yifeng,Wang, Jianqiu,Han, En-Hou,et al. Multi-scale study of ductility-dip cracking in nickel-based alloy dissimilar metal weld[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2019,35(4):545-559.
APA	Li, Yifeng,Wang, Jianqiu,Han, En-Hou,Wu, Wenbo,&Hanninen, Hannu.(2019).Multi-scale study of ductility-dip cracking in nickel-based alloy dissimilar metal weld.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,35(4),545-559.
MLA	Li, Yifeng,et al."Multi-scale study of ductility-dip cracking in nickel-based alloy dissimilar metal weld".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 35.4(2019):545-559.