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Microstructure, Residual Strain and Stress Corrosion Cracking Behavior in 316L Heat-Affected Zone
Alternative TitleMicrostructure, Residual Strain and Stress Corrosion Cracking Behavior in 316L Heat-Affected Zone
Ming Hongliang1; Zhang Zhiming1; Xiu Pengyuan1; Wang Jianqiu1; Han Enhou1; Ke Wei1; Su Mingxing2
2016
Source PublicationActa Metallurgica Sinica(English Letters)
ISSN1006-7191
Volume29Issue:9Pages:848-858
AbstractAustenitic 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.
Other AbstractAustenitic 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.
KeywordAustenitic stainless steels Heat-affected zone Microstructure EBSD Residual strain Stress corrosion cracking
Indexed ByCSCD
Language英语
CSCD IDCSCD:5804838
Citation statistics
Cited Times:8[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/156355
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.Shanghai Research Center for Weld and Detection Engineering Technique of Nuclear Equipment
Recommended Citation
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.
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