STUDY OF MICROSTRUCTURE AND STRESS CORROSION CRACKING BEHAVIOR IN WELDING TRANSITION ZONE OF Ni–BASED ALLOYS
HOU Juan 1, PENG Qunjia 2, SHOJI Testuo 2, WANG Jianqiu 1, KE Wei 1, HAN Enhou1
1. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016
2. Fracture and Reliability Research Institute, Tohoku University, Sendai 980–8579, Japan
Cite this article:
HOU Juan PENG Qunjia SHOJI Testuo WANG Jianqiu KE Wei HAN Enhou. STUDY OF MICROSTRUCTURE AND STRESS CORROSION CRACKING BEHAVIOR IN WELDING TRANSITION ZONE OF Ni–BASED ALLOYS. Acta Metall Sin, 2010, 46(10): 1258-1266.
Abstract Welding technique is generally used in nuclear power plant for manufacturing and machining important components such as steam generator. The similar metal weld and dissimilar metal weld were commonly involved to connect and fixup tubings in steam generators. However, in recent years large amounts of cracking accidents have been observed in the welded joints. A concern has been raised about the integrity and reliability in the joint transition zone due to the high susceptibility of heat affected zone (HAZ) and fusion zone (FZ) to stress corrosion cracking (SCC). In this study, the similar metal and dissimilar metal joints were investigated and compared, focusing on the correlation between microstructure, residual strain and SCC behavior. The microstructures of transition zone in Ni–based Alloys 690 and 52 similar metal joint and Alloys 182 and A533B low alloy steel dissimilar metal joint were investigated comprehensively by SEM, EBSD, TEM. The residual strain distribution in the HAZ of 690–52 similar metal joint was quantitatively measured. The SCC behavior of 182–A533B dissimilar metal joint in high temperature oxygenated water were simulated by creviced bent beam specimen. The HAZ in the similar joint exhibits higher residual strain, sensitive microstructure and high susceptibility to SCC, therefoe, the HAZ region deserve more attention during the inspection and examination of components. The FZ othe dssimilar metal joint exhibits complicated microstructure and chemical composition. The type–II which parallels the fusion boundary (FB) and type–I linking the FB and type–II was typical in the FZ of the dissimilar weld. The SCC susceptibility and cracking growth rate are higher at type–II boundary in the FZ. The role of type–I boundary is to lead the crack growth to the FB. After reaching the FB, the crack growth is blunted by pitting. The FB plays a barrier role to the crack growth in the low alloy steel. The FZ in dissimilar metal joint is weak and high susceptible to SCC.
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