Structural, mechanical and corrosion studies of Cr-rich inclusions in 152 cladding of dissimilar metal weld joint

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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.
刊名	JOURNAL OF NUCLEAR MATERIALS
	2018
卷号	498 页码:9-19
关键词	Pressurized-water Reactors Environmentally-assisted Cracking Safe-end Quantitative Assessment Secondary-side Residual-stresses High-temperature Fusion Boundary Base Alloys Part 1
ISSN号	0022-3115
英文摘要	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.
学科主题	Materials Science, Multidisciplinary ; Nuclear Science & Technology
语种	英语
资助机构	National Key Research and Development Program of China [2016YFB0300401, 2016YFE0105200]; Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDY-SSW-JSC012]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79618]
专题	金属研究所_中国科学院金属研究所
通讯作者	Wang, JQ (reprint author), Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 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.