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Comparative study of microstructure and properties of low-alloy-steel/nickel-based-alloy interfaces in dissimilar metal weld joints prepared by different GTAW methods
Ming, HL; Wang, JQ; Han, EH; Wang, JQ (reprint author), Chinese Acad Sci, Inst Met Res, Liaoning Key Lab Safety & Assessment Tech Nucl Ma, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China.
2018-05-01
Source PublicationMATERIALS CHARACTERIZATION
ISSN1044-5803
Volume139Pages:186-196
AbstractLow-alloy-steel/buttering (or welding) metal interfaces in safe-end dissimilar metal weld joints (DMWJs) at nuclear power plants are weak parts. To optimize the quality of the safe-end DMWJs used for the construction of domestic nuclear power plants and to improve the welding productivity, a series of DMWJs in full-size have been manufactured by using different gas tungsten arc welding (GTAW) methods. The microstructure, chemical composition distribution and local properties across the SA508/52(M) interfaces in these DMWJs are studied. The high heat input and long high temperature duration during hot-wire GTAW process promote the carbon diffusion and grain boundary migration and hence the DMWJ by hot-wire GTAW has the largest amount of type I and type II boundaries and the widest carbon depleted zones and carbon enriched zones, which resulting in the worst performance among the DMWJs in simulated primary water. Type I and type II boundaries are high angle random grain boundaries (RGBs) and Cr-depleted zones are found along type II boundaries resulting in their high susceptibility to SCC. In addition, these boundaries are prone to be cracked during mechanical bending process.; Low-alloy-steel/buttering (or welding) metal interfaces in safe-end dissimilar metal weld joints (DMWJs) at nuclear power plants are weak parts. To optimize the quality of the safe-end DMWJs used for the construction of domestic nuclear power plants and to improve the welding productivity, a series of DMWJs in full-size have been manufactured by using different gas tungsten arc welding (GTAW) methods. The microstructure, chemical composition distribution and local properties across the SA508/52(M) interfaces in these DMWJs are studied. The high heat input and long high temperature duration during hot-wire GTAW process promote the carbon diffusion and grain boundary migration and hence the DMWJ by hot-wire GTAW has the largest amount of type I and type II boundaries and the widest carbon depleted zones and carbon enriched zones, which resulting in the worst performance among the DMWJs in simulated primary water. Type I and type II boundaries are high angle random grain boundaries (RGBs) and Cr-depleted zones are found along type II boundaries resulting in their high susceptibility to SCC. In addition, these boundaries are prone to be cracked during mechanical bending process.
description.department[ming, hongliang ; wang, jianqiu ; han, en-hou] chinese acad sci, inst met res, liaoning key lab safety & assessment tech nucl ma, key lab nucl mat & safety assessment, shenyang 110016, peoples r china
KeywordLocal Mechanical-properties Dip Cracking Susceptibility Stress-corrosion Cracking Fusion Boundary Region Safe-end Ferritic Steel Part 1
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
Funding OrganizationCAS [QYZDY-SSW-JSC012]; National Key Research and Development Program of China [2017YFB0702100, 2016YFE0105200]; Chinese Academy of Sciences [ZDRW-CN-2017-1]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79322
Collection中国科学院金属研究所
Corresponding AuthorWang, JQ (reprint author), Chinese Acad Sci, Inst Met Res, Liaoning Key Lab Safety & Assessment Tech Nucl Ma, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Ming, HL,Wang, JQ,Han, EH,et al. Comparative study of microstructure and properties of low-alloy-steel/nickel-based-alloy interfaces in dissimilar metal weld joints prepared by different GTAW methods[J]. MATERIALS CHARACTERIZATION,2018,139:186-196.
APA Ming, HL,Wang, JQ,Han, EH,&Wang, JQ .(2018).Comparative study of microstructure and properties of low-alloy-steel/nickel-based-alloy interfaces in dissimilar metal weld joints prepared by different GTAW methods.MATERIALS CHARACTERIZATION,139,186-196.
MLA Ming, HL,et al."Comparative study of microstructure and properties of low-alloy-steel/nickel-based-alloy interfaces in dissimilar metal weld joints prepared by different GTAW methods".MATERIALS CHARACTERIZATION 139(2018):186-196.
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