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Apport à la compréhension du comportement sous irradiation des aciers austénitiques

Abstract : Austenitic stainless steels are foreseen as cladding and structural materials for future generation IV reactors. As part of this important subject, this research addresses to two main objectives. The first one is to describe properly the microstructure evolution of austenitic steels under irradiation in the incubation period in terms of dislocations, cavities, and precipitates. The second is to get a better insight into the role of chemical composition on austenitic steel swelling by focusing mainly on 2 elements: titanium which is an alloying element (less than 1%) and chromium which is one of the major element in austenitic steels. In order to do so, we will follow two complementary routes: experimental work and numerical simulations using the formalism of rate equation cluster dynamics (RECD). In a first step, the chemical composition of advanced austenitic steels appears to be too complex for an exhaustive study of the role of all elements (more than a dozen of elements), especially for numerical simulations. The research will thus be conducted in Ni and model alloys pure Ni, Ni-Ti, Ni-Cr and Ni-TiC that have the same crystalline structure (CFC) as all austenitic steels but more specific composition.
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Kan Ma. Apport à la compréhension du comportement sous irradiation des aciers austénitiques. Chimie théorique et/ou physique. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLC012⟩. ⟨tel-03541308⟩

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