Journal
CORROSION SCIENCE
Volume 206, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110502
Keywords
Alloy; STEM; Oxidation; Intergranular corrosion; Stress corrosion
Funding
- National Natural Science Foundation of China [51971172]
- Young Talent Support Plan of Xian Jiaotong University
- Nanoscale (CAMP-Nano) of Xi?an Jiaotong Uni-versity
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The initiation of stress corrosion cracking in alloy 690 in simulated PWR primary water is inhibited by intergranular carbide precipitation, but this effect weakens with increasing strain rate.
The stress corrosion cracking (SCC) initiation of alloy 690 in simulated PWR primary water was evaluated in constant extension rate tensile tests with different strain rates. The SCC initiation was inhibited by intergranular carbide precipitation. However, the carbide effect weakened with increasing strain rate. The SCC mitigation effect of carbides mainly arises from the carbides' ability to impede the transfer of dislocations across grain boundaries and delay the local break-down of surface oxide films. However, dislocations accumulated near the grain boundary can promote intergranular oxidation which induces cracking after the oxide film fails.
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