Journal
CORROSION SCIENCE
Volume 152, Issue -, Pages 82-92Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.03.014
Keywords
Alloy 600; Crack initiation; Crack propagation; Selective oxidation; Grain boundary; Migration
Funding
- China Scholarship Council
- EPSRC [EP/K040375/1, EP/N010868/1, EP/R009392/1]
- EPSRC [EP/R009392/1] Funding Source: UKRI
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The crack initiation on a cold-worked surface of Alloy 600, exposed to simulated pressurized water reactor primary water, was mechanistically studied through high-resolution characterization. Mechanical polishing introduced a thin recrystallization layer on the specimen surface, which lead to the crack initiation along highly-deformed recrystallization grain boundaries after preferential oxidation. Intergranular crack propagation occurred once the initiation cracks met the matrix grain boundaries under the external loading and the residual stress introduced by the prior 20% cold working. The controlling mechanism of SCC crack propagation was believed to be an intergranular selective oxidation mechanism.
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