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Structural, mechanical and corrosion studies of Cr-rich inclusions in 152 cladding of dissimilar metal weld joint
Li, YF; Wang, JQ; Han, EH; Yang, CD; Wang, JQ (reprint author), Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China.
2018
Source PublicationJOURNAL OF NUCLEAR MATERIALS
ISSN0022-3115
Volume498Pages:9-19
AbstractCr-rich inclusions were discovered in 152 cladding at the inner wall of domestic dissimilar metal weld joint, and their morphologies, microstructures, mechanical properties and corrosion behaviors were systematically characterized by SEM, TEM, nanoindentation and FIB. The results indicate that the Cr-rich inclusions originate from large-size Cr particles in 152 welding electrode flux, and they are 50-150 mm in size in most cases, and there is a continuous transition zone of 2-5 mm in width between the Cr inclusion core and 152 cladding matrix, and the transition zone consists of Ni & Fe-rich dendritic austenite and Cr23C6 and Cr matrix. The transition zone has the highest nanoindentation hardness (7.66 GPa), which is much harder than the inclusion core (5.14 GPa) and 152 cladding (3.71 GPa). In-situ microscopic tensile tests show that cracks initialize preferentially in transition zone, and then propagate into the inclusion core, and creep further into 152 cladding after penetrating the core area. The inclusion core and its transition zone both share similar oxide film structure with nickel-base 152 cladding matrix in simulated primary water, while those two parts present better general corrosion resistance than 152 cladding matrix due to higher Cr concentration. (C) 2017 Elsevier B.V. All rights reserved.; Cr-rich inclusions were discovered in 152 cladding at the inner wall of domestic dissimilar metal weld joint, and their morphologies, microstructures, mechanical properties and corrosion behaviors were systematically characterized by SEM, TEM, nanoindentation and FIB. The results indicate that the Cr-rich inclusions originate from large-size Cr particles in 152 welding electrode flux, and they are 50-150 mm in size in most cases, and there is a continuous transition zone of 2-5 mm in width between the Cr inclusion core and 152 cladding matrix, and the transition zone consists of Ni & Fe-rich dendritic austenite and Cr23C6 and Cr matrix. The transition zone has the highest nanoindentation hardness (7.66 GPa), which is much harder than the inclusion core (5.14 GPa) and 152 cladding (3.71 GPa). In-situ microscopic tensile tests show that cracks initialize preferentially in transition zone, and then propagate into the inclusion core, and creep further into 152 cladding after penetrating the core area. The inclusion core and its transition zone both share similar oxide film structure with nickel-base 152 cladding matrix in simulated primary water, while those two parts present better general corrosion resistance than 152 cladding matrix due to higher Cr concentration. (C) 2017 Elsevier B.V. All rights reserved.
description.department[li, yifeng ; wang, jianqiu ; han, en-hou] chinese acad sci, inst met res, key lab nucl mat & safety assessment, shenyang 110016, liaoning, peoples r china ; [li, yifeng] univ sci & technol china, sch mat sci & engn, shenyang 110016, liaoning, peoples r china ; [yang, chengdong] shanghai res ctr weld & detect engn tech nucl equ, shanghai 201306, peoples r china
KeywordPressurized-water Reactors Environmentally-assisted Cracking Safe-end Quantitative Assessment Secondary-side Residual-stresses High-temperature Fusion Boundary Base Alloys Part 1
Subject AreaMaterials Science, Multidisciplinary ; Nuclear Science & Technology
Funding OrganizationNational Key Research and Development Program of China [2016YFB0300401, 2016YFE0105200]; Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDY-SSW-JSC012]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79618
Collection中国科学院金属研究所
Corresponding AuthorWang, JQ (reprint author), Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
GB/T 7714
Li, YF,Wang, JQ,Han, EH,et al. Structural, mechanical and corrosion studies of Cr-rich inclusions in 152 cladding of dissimilar metal weld joint[J]. JOURNAL OF NUCLEAR MATERIALS,2018,498:9-19.
APA Li, YF,Wang, JQ,Han, EH,Yang, CD,&Wang, JQ .(2018).Structural, mechanical and corrosion studies of Cr-rich inclusions in 152 cladding of dissimilar metal weld joint.JOURNAL OF NUCLEAR MATERIALS,498,9-19.
MLA Li, YF,et al."Structural, mechanical and corrosion studies of Cr-rich inclusions in 152 cladding of dissimilar metal weld joint".JOURNAL OF NUCLEAR MATERIALS 498(2018):9-19.
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