Etude du piégeage de l’hydrogène dans un acier inoxydable austénitique dans le cadre de la corrosion sous contrainte assistée par l’irradiation

Abstract : Some components of vessel internals in pressurized water reactor (PWR) made of stainless steel, have shown cracks induced by Irradiation-Assisted Stress Corrosion Cracking (IASCC). This complex phenomenon originates from the coupling between the material itself, a tensile stress state, environmental conditions and irradiation. This PhD thesis aims at studying the influence of hydrogen in IASCC and particularly its interactions with the defects created by neutron irradiation in a 316L austenitic stainless steel. Thanks to ion implantation, defects similar to neutron irradiation-induced defects were created. As a first step, hydrogen - defects interactions were studied with a model approach consisting in deuterium cathodic charging. Deuterium was used as an isotopic tracer for hydrogen. This technique allowed to highlight hydrogen trapping by implantation-induced defects (mostly by the cavities) in 316L stainless steel. Simulation of hydrogen diffusion and trapping in the studied materials with a numerical resolution model of McNabb and Foster’s equations confirmed the experimental results. Then, oxidation tests were performed in PWR simulated primary environment at 320 °C in order to study the effects of irradiation-induced defects on the oxidation and the hydrogen uptake of the 316L stainless steel. The major highlight of these experiments was the observation of hydrogen accumulation in the alloy beneath the oxide, due to trapping by vacancies created by oxidation process and by ion implantation. In addition, hydrogen trapping was observed deeper in the alloy and it was attributed to the cavities induced by implantation.
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Anne-Cécile Bach. Etude du piégeage de l’hydrogène dans un acier inoxydable austénitique dans le cadre de la corrosion sous contrainte assistée par l’irradiation. Matériaux. PSL Research University, 2018. Français. ⟨NNT : 2018PSLEM044⟩. ⟨tel-02142048⟩

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