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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 Publication | JOURNAL OF NUCLEAR MATERIALS
 |
| ISSN | 0022-3115 |
| Volume | 498Pages:9-19 |
| Abstract | 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.; 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 |
| Keyword | Pressurized-water Reactors Environmentally-assisted Cracking Safe-end Quantitative Assessment Secondary-side Residual-stresses High-temperature Fusion Boundary Base Alloys Part 1 |
| Subject Area | Materials Science, Multidisciplinary ; Nuclear Science & Technology |
| Funding Organization | National Key Research and Development Program of China [2016YFB0300401, 2016YFE0105200]; Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDY-SSW-JSC012] |
| Indexed By | SCI |
| Language | 英语 |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/79618 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Wang, 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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