Journal
CORROSION SCIENCE
Volume 53, Issue 12, Pages 4309-4317Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2011.08.046
Keywords
Low alloy steel; Alloy; SEM; TEM; Stress corrosion; Welding
Funding
- program on Mechanism of SCC in the Fusion Boundary Region of Ni-base weld metal and Low Alloy Steel Dissimilar Weld Joints in High Temperature Oxygenated Water
- Japanese BWR
- Chinese Academy of Sciences
- NSFC [50875207, 11072191]
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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. (C) 2011 Elsevier Ltd. All rights reserved.
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