Journal
CORROSION SCIENCE
Volume 100, Issue -, Pages 474-483Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2015.08.010
Keywords
Alloy 600; Preferential intergranular oxidation; Grain boundary migration; Microstructure; AEM
Funding
- AREVA
- HM Government (UK)
- EPSRC [EP/J021229/1] Funding Source: UKRI
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Oxidation of solution-annealed Alloy 600 has been performed in a hydrogenated steam environment, which is considered to simulate PWR primary water exposure. FIB and analytical TEM characterization, coupled with detailed SEM analyses, provided unequivocal evidence of localized grain boundary migration and intergranular oxide penetrations. These localized migrations were associated with pronounced Cr and Fe depletions, highlighting the role of the grain boundaries for Cr diffusion for intergranular oxidation. These findings are discussed in relation to the early stages of intergranular oxidation, diffusion-induced grain boundary migration and subsequent SCC initiation. (C) 2015 Elsevier Ltd. All rights reserved.
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