A Mechano-Chemical Coupling for Hydrogen Diffusion in Metals Based on a Thermodynamic Approach

Nicolas Creton; Steeve Dejardin; B. Grysakowski; Virgil Optasanu; Tony Montesin

doi:10.4028/www.scientific.net/DDF.353.286

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A Mechano-Chemical Coupling for Hydrogen Diffusion in Metals Based on a Thermodynamic Approach
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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 353A Mechano-Chemical Coupling for Hydrogen Diffusion...

A Mechano-Chemical Coupling for Hydrogen Diffusion in Metals Based on a Thermodynamic Approach

Abstract:

Hydrogen diffusion in metals is still an ongoing topic of research due to its technical relevance (hydrogen embrittlement, hydrogen storage...). In the last decades, significant progress in understanding the time evolution of the hydrogen concentration in solids was completed. This paper presents a modeling of hydrogen diffusion with a general and thermodynamically based diffusion concept coupled with mechanical and chemical aspects. This model was previously used to simulate the oxidation of a metal [1][2]. This concept has been upgraded to offer a thoroughly macroscopic behavior law used to simulate hydrogen diffusion in metal parts under mechanical loadings. The thermodynamic approach of the stress-diffusion coupling was implemented in a finite element code in order to study the hydrogen diffusion mode into a strained metal. Simulations were performed on a cylindrical austenitic steel tank under important internal pressure. The results of this study allow us to understand how hydrogen diffusion and mechanical stresses are mutually induced and modified.

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Periodical:

Defect and Diffusion Forum (Volume 353)

Pages:

286-291

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.353.286

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Online since:

May 2014

Authors:

Nicolas Creton*, Steeve Dejardin, B. Grysakowski, Virgil Optasanu, Tony Montesin

Keywords:

Hydrogen Diffusion, Stress-Diffusion Coupling

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