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Microstructure and stress corrosion cracking of the fusion boundary region in an alloy 182-A533B low alloy steel dissimilar weld joint |
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| Authors: | Juan Hou Qunjia Peng Yoichi Takeda Jiro Kuniya Tetsuo Shoji |
| Affiliation: | aFracture and Reliability Research Institute, Tohoku University, 6-6-01, Aramaki Aoba, Aoba-ku, Sendai City 980-8579, Japan;bState Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, Shenyang 110016, China |
| Abstract: | Stress corrosion cracking (SCC) in the fusion boundary (FB) region of an Alloy 182-A533B low alloy steel (LAS) dissimilar weld joint in high temperature water doped with sulfate was studied following a microstructure characterization of the FB region. The microstructure characterization suggested the type-II and type-I boundaries in the dilution zone (DZ) adjacent to the FB had lower resistance to SCC growth than the FB. Crack propagating perpendicular to the FB in the DZ was observed to be blunted by pitting at the FB, followed by the reactivation from the pitting by localized oxidation along the grain boundary in LAS. |
| Keywords: | C Stress corrosion cracking C Microstructure A Dissimilar weld joint C Fusion boundary C Type-II boundary C High temperature oxygenated water |
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