Pre-Stressed Sub-Surface Contribution on Bulk Diffusion in Metallic Solids

Abstract:

Our recent modelling works and corresponding numerical simulations realized to describe the UO₂ oxidation processes confirm the theory showing that an applied mechanical strain can strongly affect the local oxygen diffusion in a stressed solid. This result allows us to assume that stress field, previously applied at the surface of a metallic sample on several microns, will delay the degradation during its oxidation. Considering this hypothesis, we implemented a FEM simulation code developed in our laboratory to numerically investigate some different stress fields applied on a sample sub-surface, that might significantly modify the volume diffusion of oxygen during the oxidation process. The results of our simulations are presented and discussed from the perspective to study the consequences of a surface mechanical treatment on the durability of a metallic material.

• Periodical: Defect and Diffusion Forum (Volumes 309-310)
• Pages: 149-154
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.309-310.149
• Online since: March 2011
• Authors: Laura Raceanu, Virgil Optasanu, Tony Montesin, Nicolas Creton
• Keywords: FEM Simulation, Stress-Diffusion Coupling, Surface Treatment, Zirconium

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