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Article Dans Une Revue Corrosion Science Année : 2020

On the role of surface deformation in the oxidation of NiCr alloys at 340–600 °C

Sur le rôle de la déformation de surface dans l'oxydation des alliages NiCr à 340-600 °C

Résumé

The effect of surface deformation on selective oxidation is studied on a Ni-30Cr alloy prepared by grinding (SiC paper) vs. polishing (diamond suspensions), and oxidized in air at 340-600 • C. Imaging and subsurface composition profiling by transmission electron microscopy are combined to investigate the relationships between microstructure, diffusion and oxidation. The depth of deformed material is found to be critical to selective oxidation. Atypical Cr depletion profiles reflect an abrupt change in diffusion properties between the severely deformed subsurface and the bulk. The relative contributions of grain boundary, dislocation and bulk diffusion to the Cr flux are examined based on short-circuit diffusion theory.
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Dates et versions

hal-02899636 , version 1 (15-07-2020)

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Thomas Gheno, Clara Desgranges, Laure Martinelli. On the role of surface deformation in the oxidation of NiCr alloys at 340–600 °C. Corrosion Science, 2020, 108805, p. 1-14. ⟨10.1016/j.corsci.2020.108805⟩. ⟨hal-02899636⟩
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