Modelling of the effect of grain boundary diffusion on the oxidation of Ni-Cr alloys at high temperature

•Oxidation kinetics modelling has been performed considering diffusion through oxide scale by both grain boundaries and lattice.•Some analytical and numerical oxidation kinetics models are proposed assuming that oxide grains grow over time or follow a gran size gradient.•The impact of oxide microstr...

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Bibliographic Details
Published in:Corrosion science 2018-05, Vol.136, p.148-160
Main Authors: Bataillou, Léa, Desgranges, Clara, Martinelli, Laure, Monceau, Daniel
Format: Article
Language:English
Subjects:
Biochemistry
Chemical Sciences
Condensed Matter
Diffusion
Diffusion effects
Grain boundaries
Grain boundary diffusion
Grain size
Material chemistry
Materials Science
Mathematical models
Modelling
Nickel chromium alloys
Oxidation
Oxidation kinetics
Physics
Polycrystals
Quantitative analysis
Reaction kinetics
Scale (corrosion)
Short circuits
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Summary:•Oxidation kinetics modelling has been performed considering diffusion through oxide scale by both grain boundaries and lattice.•Some analytical and numerical oxidation kinetics models are proposed assuming that oxide grains grow over time or follow a gran size gradient.•The impact of oxide microstructure evolution on oxidation kinetics has been highlighted.•Two treatment and extrapolation methods are compared and discussed. Grain boundaries in oxide scales have a strong effect on oxidation kinetics when they act as diffusion short circuits. This study proposes a quantitative evaluation of the phenomenon by modelling. Various cases of oxide microstructure evolution are treated using both analytical and numerical resolutions. Results showed that the effect of oxide grain growth on the oxidation kinetics can be analysed considering a transitory stage for which the oxidation kinetics is not purely parabolic. Some guidelines for choosing the appropriate post-treatment method for the analysis and extrapolation of experimental oxidation kinetics are given.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2018.03.001