Chemical Evolution in the Substrate due to Oxidation: A Numerical Model with Explicit Treatment of Vacancy Fluxes

Nathalie Bertrand; Clara Desgranges; Maylise Nastar; Gouenou Girardin; Dominique Poquillon; Daniel Monceau

doi:10.4028/www.scientific.net/MSF.595-598.463

Paper Titles

Modelling of Corrosion Induced Stresses during Zircaloy-4 Oxidation in Air
p.419

Thermodynamic Modelling of the Destruction of the Surface Cr₂O₃ on Alloy 230 in the Impure Helium Atmosphere of a Gas Cooled Reactor
p.429

Comparison of the High Temperature Surface Reactivity in Impure Helium of Two Materials for Gas Cooled Reactors
p.439

Kinetic Study of the Low Temperature Internal Oxidation of Nickel Based Model Alloys Exposed to PWR Primary Water
p.449

Chemical Evolution in the Substrate due to Oxidation: A Numerical Model with Explicit Treatment of Vacancy Fluxes
p.463

Corrosion of T91 Steel in LBE: Contribution to the Study of the Pb–Bi–O–Fe–Hg System - Thermodynamic Description of PbO–Fe₂O₃
p.473

Electrochemical Study of the Corrosion of Metals in Molten Fluorides
p.483

Influence of Al on the High Temperature Corrosion Behaviour of Inconel 617 in VHTR Primary Coolant Atmosphere
p.491

Oxide Layers Mechanical Properties for Ni Base Alloys in HTR Environment
p.501

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Chemical Evolution in the Substrate due to Oxidation: A Numerical Model with Explicit Treatment of Vacancy Fluxes

Abstract:

To get a better understanding of oxidation behavior of Ni-base alloys in PWR primary water, a numerical model for oxide scale growth has been developed. The final aim of the model is to estimate the effects of possible changes of experimental conditions. Hence, our model has not been restricted by the classical hypothesis of quasi-steady state and can consider transient stages. The model calculates the chemical species concentration profiles, but also the vacancy concentration profiles evolution in the oxide and in the metal as a function of time. It treats the elimination of the possible supersaturated vacancies formed at the metal/oxide interface by introducing a dislocation density at the interface and in the metal bulk. This latter density can be related to the cold-working state. Its effect on the vacancy profile evolution is studied in the case of a pure metal. Eventually an extension of the present model to the oxidation of Ni-base alloys is discussed regarding a recent vacancy diffusion model adjusted on Ni-base alloys.