EDP Sciences Journals List
Issue J. Phys. IV France
Volume 10, Number PR6, April 2000
The Sixth Japan-France Materials Science Seminar
JFMSS-6
Microstructural Design for Improved Mechanical Behaviour of Advanced Materials
Page(s) Pr6-179 - Pr6-184
DOI http://dx.doi.org/10.1051/jp4:2000631

The Sixth Japan-France Materials Science Seminar
JFMSS-6
Microstructural Design for Improved Mechanical Behaviour of Advanced Materials

J. Phys. IV France 10 (2000) Pr6-179-Pr6-184

DOI: 10.1051/jp4:2000631

Modelling of hydrogen - dislocation interactions during stress corrosion cracking

T. Magnin and D. Delafosse

École des Mines, Centre SMS, URA 1884 du CNRS, 158 cours Fauriel, 42023 Saint-Etienne, France


Abstract
This paper presents a simulation method that is aimed at investigating the elementary mechanisms governing the process of Stress Corrosion Cracking under cathodic hydrogen discharge. Key issues concerning the experimental evidences of localised corrosion - deformation interactions and the relevant modelling are briefly recalled. The simulation method is introduced and the first results on elementary configurations outline the basic mechanisms of hydrogen - plasticity interactions at a Stress Corrosion crack tip. The effect of hydrogen on the density of a dislocation pile-up is examined. The particular situation at the tip of a loaded crack is examined via the introduction of image forces on diffusing interstitial hydrogen. Conclusions are drawn concerning the basic ingredients of the model, as well as future developments of the simulation technique.



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