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Multi-scale study of ductility-dip cracking in nickel-based alloy dissimilar metal weld
Li, Yifeng; Wang, Jianqiu; Han, En-Hou; Wu, Wenbo; Hanninen, Hannu
2019-04-01
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume35Issue:4Pages:545-559
AbstractA 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.
KeywordDissimilar metal weld Nickel-base alloy Ductility-dip cracking (DDC) Slow strain rate tensile (SSRT) testing Thermal expansion coefficient
Indexed BySCI
Language英语
WOS IDWOS:000455967200011
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81246
Collection中国科学院金属研究所
Recommended Citation
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.
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