Quantitative assessment of intergranular damage due to PWR primary water exposure in structural Ni-based alloys

Abstract : Two nickel-based alloys, alloy 718 and alloy 600, known to have different resistances to IGSCC, were exposed to a simulated PWR primary water environment at 360 °C for 1000 h. The intergranular oxidation damage was analyzed in detail using an original approach involving two characterization methods (Incremental Mechanical Polishing/Microcopy procedure and SIMS imaging) which yielded a tomographic analysis of the damage. Intergranular oxygen/oxide penetrations occurred either as connected or isolated penetrations deep under the external oxide/substrate interface as far as 10 μm for alloy 600 and only 4 μm for alloy 718. Therefore, assessing this damage precisely is essential to interpret IGSCC susceptibility.
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Benoît Ter-Ovanessian, Julien Deleume, Jean-Marc Cloué, Eric Andrieu. Quantitative assessment of intergranular damage due to PWR primary water exposure in structural Ni-based alloys. Corrosion Science, Elsevier, 2013, vol. 67, pp. 11-19. ⟨10.1016/j.corsci.2012.09.048⟩. ⟨hal-00864144⟩

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