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Modélisation polycristalline et étude expérimentale du comportement mécanique d'aciers Fe-Mn à l'effet TWIP : prise en compte du traitement thermique d'élaboration sur le maclage et les contraintes internes

Abstract : Steels having TWIP effect (TWinning Induced Plasticity) are very interesting for the worldwide siderurgy, because they simultaneously combine very high mechanical strength and ductility. These excellent mechanical properties are related to the presence of mechanical twinning, the so-called TWIP effect. The major objective of this thesis is to study the TWIP effect on several grades of Fe-Mn steels (entirely austenitic, austeno-ferritic duplex) in order to develop a predictive behavior law of steels with TWIP effect. The first part of this work consisted of the modelling of the behavior of Fe-Mn-C austenitic steels having TWIP effect. A micromechanical model using the scale transition method in elastoviscoplasticity has been developed. It is based on a physical description of the deformation mechanisms considered in this study: crystallographic slip and mechanical twinning. The twin-slip and twin-twin interactions in relation with the hardening behaviour at the polycrystal scale and the grain scale have been finely analyzed.The second part of this work is concentrated on the characterization of the behavior of Fe-Mn-Al-C duplex steels by X-rays diffraction in order to evaluate the initial internal stresses in the two phases as well as their evolution with the deformation during an in situ tensile test. A modeling of the duplex steel behavior was established in order to develop an optimization tool of the microstructure (proportion of the ferritic/austenitic phase) in an approach "Alloy design". Then, tests of heat treatment were made in order to generate the TWIP effect in the duplex steels
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Mohamad Najeeb Shiekhelsouk. Modélisation polycristalline et étude expérimentale du comportement mécanique d'aciers Fe-Mn à l'effet TWIP : prise en compte du traitement thermique d'élaboration sur le maclage et les contraintes internes. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ038S⟩. ⟨tel-01752873⟩

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