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Intergranular oxidation of nickel-base alloys : potentialities of focused ion beam tomography

Cecilie Duhamel 1 Jacqueline Caballero 1 Thierry Couvant 2 Jérôme Crépin 1 Fabrice Gaslain 1 Catherine Guerre 3 Hong-Thaï Le 1 Mickael Wehbi 1, 2
3 LECA - Laboratoire d'Etude de la Corrosion Aqueuse
SCCME - Service de la Corrosion et du Comportement des Matériaux dans leur Environnement : DEN/DPC/SCCME/LECA
Abstract : The present work focuses on the intergranular oxidation of Alloy 600 and its weld material Alloy 82 after exposure in simulated primary water at 340–360 °C during 1000–1400 h. The effects of intergranular chromium carbides, grain boundary character and pre-straining are studied either on industrial heats or model microstructures. Three-dimensional reconstructions of well-chosen grain boundaries are obtained using focused ion beam tomography in a scanning electron microscope. The 3D characterizations show that (1) twin boundaries are less susceptible to oxidation than high-angle grain boundaries; (2) intergranular chromium carbides delay the intergranular oxidation kinetics; (3) the intergranular oxidation depth is quite homogeneous along a given grain boundary except when strain heterogeneity exists in its vicinity, (4) strain heterogeneity tends to accelerate the intergranular oxidation kinetics; and (5) crack initiation in the oxidized grain boundary occurs at the alloy/oxide interface.
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Submitted on : Monday, October 2, 2017 - 3:13:34 PM
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Cecilie Duhamel, Jacqueline Caballero, Thierry Couvant, Jérôme Crépin, Fabrice Gaslain, et al.. Intergranular oxidation of nickel-base alloys : potentialities of focused ion beam tomography. Oxidation of Metals, Springer Verlag, 2017, 88 (3-4), pp.447-457. ⟨10.1007/s11085-016-9688-y⟩. ⟨hal-01599811⟩



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