Abstract
Many transgranular stress corrosion cracking models take into account the effects of hydrogen on the crack-tip plasticity. Our numerical simulations allow a quantitative approach of these hydrogen-dislocation interaction mechanisms. Hydrogen is shown to segregate on edge dislocations and to decrease their elastic interactions, thus causing a localised softening effect. This emphasises the formation of strong pile-ups which can promote local microfracture. First, it increases the dislocation density in the pile-up and second, it decreases the cross-slip ability.
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