Comparative study of microstructure and properties of low-alloy-steel/nickel-based-alloy interfaces in dissimilar metal weld joints prepared by different GTAW methods

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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.
刊名	MATERIALS CHARACTERIZATION
	2018-05-01
卷号	139 页码:186-196
关键词	Local Mechanical-properties Dip Cracking Susceptibility Stress-corrosion Cracking Fusion Boundary Region Safe-end Ferritic Steel Part 1
ISSN号	1044-5803
英文摘要	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.; 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.
学科主题	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
语种	英语
资助机构	CAS [QYZDY-SSW-JSC012]; National Key Research and Development Program of China [2017YFB0702100, 2016YFE0105200]; Chinese Academy of Sciences [ZDRW-CN-2017-1]
公开日期	2018-06-05
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79322]
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, Liaoning Key Lab Safety & Assessment Tech Nucl Ma, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China.
推荐引用方式 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.