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Role of water chemistry and microstructure in stress corrosion cracking in the fusion boundary region of an Alloy 182-A533B low alloy steel dissimilar weld joint in high temperature water |
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| Authors: | Qunjia Peng He Xue Juan Hou Kazuhiko Sakaguchi Yoichi Takeda Jiro Kuniya Tetsuo Shoji |
| Affiliation: | aState Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, 62 Wencui Road, Shenyang 110016, China;bFracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University, 6-6-01, Aramaki Aoba, Aoba-ku, Sendai 980-8579, Japan;cSchool of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China |
| Abstract: | Stress corrosion cracking (SCC) in the fusion boundary (FB) region of an Alloy 182-low alloy steel (LAS) dissimilar weld joint in 288 °C water was investigated by experiments and finite element simulation. Creviced bent beam and crack growth rate (CGR) experiments showed that, while the FB was a barrier to SCC growth, further crack growth into LAS was activated by a combined effect of sulfate and dissolved oxygen in water. Finite element simulation suggested that a positive gradient of hardness as the crack approached to the FB in dilution zone caused decreased CGR. Role of microstructure and water chemistry in SCC was discussed. |
| Keywords: | A Low alloy steel A Alloy B SEM B TEM C Stress corrosion C Welding |
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