Microstructure, Residual Strain and Stress Corrosion Cracking Behavior in 316L Heat-Affected Zone

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	Microstructure, Residual Strain and Stress Corrosion Cracking Behavior in 316L Heat-Affected Zone
其他题名	Microstructure, Residual Strain and Stress Corrosion Cracking Behavior in 316L Heat-Affected Zone
	Ming Hongliang 1; Zhang Zhiming 1; Xiu Pengyuan 1; Wang Jianqiu 1; Han Enhou 1; Ke Wei 1; Su Mingxing 2
	2016
发表期刊	Acta Metallurgica Sinica(English Letters)
ISSN	1006-7191
卷号	29 期号:9 页码:848-858
摘要	Austenitic stainless steels are usually chosen to make many components of nuclear power plants (NPPs). However, their microstructure in the heat-affected zone (HAZ) will change during the welding process. Some failures of the weld joints, mainly stress corrosion cracking (SCC), have been found to be located in the HAZ. In this research, the microstructure, micro-hardness, residual strain and SCC behavior at different locations of the 316L HAZ cut from a safeend dissimilar metal weld joint were studied. However, traditional optical microscope observation could not find any microstructural difference between the HAZ and the base metal, higher residual strain and micro-hardness, and higher fraction of random high-angle grain boundaries were found in the HAZ than in the base metal when studied by using electron back-scattering diffraction scanning and micro-hardness test. What's more, the residual strain, the microhardness and the fraction of random grain boundaries decreased, while the fraction of coincidence site lattice grain boundaries increased with increasing the distance from the fusion boundary in 316L HAZ. Creviced bent beam test was applied to evaluate the SCC susceptibility at different locations of 316L HAZ and base metal. It was found that the HAZ had higher SCC susceptibility than the base metal and SCC resistance increased when increasing the distance from the fusion boundary in 316L HAZ.
其他摘要	Austenitic stainless steels are usually chosen to make many components of nuclear power plants (NPPs). However, their microstructure in the heat-affected zone (HAZ) will change during the welding process. Some failures of the weld joints, mainly stress corrosion cracking (SCC), have been found to be located in the HAZ. In this research, the microstructure, micro-hardness, residual strain and SCC behavior at different locations of the 316L HAZ cut from a safeend dissimilar metal weld joint were studied. However, traditional optical microscope observation could not find any microstructural difference between the HAZ and the base metal, higher residual strain and micro-hardness, and higher fraction of random high-angle grain boundaries were found in the HAZ than in the base metal when studied by using electron back-scattering diffraction scanning and micro-hardness test. What's more, the residual strain, the microhardness and the fraction of random grain boundaries decreased, while the fraction of coincidence site lattice grain boundaries increased with increasing the distance from the fusion boundary in 316L HAZ. Creviced bent beam test was applied to evaluate the SCC susceptibility at different locations of 316L HAZ and base metal. It was found that the HAZ had higher SCC susceptibility than the base metal and SCC resistance increased when increasing the distance from the fusion boundary in 316L HAZ.
关键词	Austenitic stainless steels Heat-affected zone Microstructure EBSD Residual strain Stress corrosion cracking
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:5804838
引用统计	被引频次：9[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/156355
专题	中国科学院金属研究所
作者单位	1.中国科学院金属研究所 2.Shanghai Research Center for Weld and Detection Engineering Technique of Nuclear Equipment
推荐引用方式 GB/T 7714	Ming Hongliang,Zhang Zhiming,Xiu Pengyuan,et al. Microstructure, Residual Strain and Stress Corrosion Cracking Behavior in 316L Heat-Affected Zone[J]. Acta Metallurgica Sinica(English Letters),2016,29(9):848-858.
APA	Ming Hongliang.,Zhang Zhiming.,Xiu Pengyuan.,Wang Jianqiu.,Han Enhou.,...&Su Mingxing.(2016).Microstructure, Residual Strain and Stress Corrosion Cracking Behavior in 316L Heat-Affected Zone.Acta Metallurgica Sinica(English Letters),29(9),848-858.
MLA	Ming Hongliang,et al."Microstructure, Residual Strain and Stress Corrosion Cracking Behavior in 316L Heat-Affected Zone".Acta Metallurgica Sinica(English Letters) 29.9(2016):848-858.