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Etude de la recristallisation au cours du laminage a chaud d’aciers a basse densite fer-aluminium

Abstract : The instructions of the European Union pilot the R&D in the automotive industry regarding the use of lightweight materials which aims at reducing fuel consumption and emission of exhaust gases.The objective is to develop steels of density reduced by at least 10% (ρmax ≈ 7g/cm3). Iron aluminum alloys display promising physical and mechanical properties but they often exhibit surface defects, referred to as roping, appearing after the deep drawing process. This study was carried out to better understand the conditions of recrystallization during hot rolling to control the microstructure and thereby limit these defects.During hot deformation, it is generally agreed that geometric dynamic recrystallization (GDRX) and continuous dynamic recrystallization (CDRX) operate in ferritic alloys with high stacking fault energy. In this study, the existence of a transition between CDRX and the mechanism of discontinuous dynamic recrystallization (DDRX) has been brought into evidence in the temperature range 900 1100°C and strain rate range 0.1-50s-1. Post-dynamic recrystallization was also studied to observe the evolution of microstructure during holding temperatures.A model formerly developed for the CDRX of aluminum was then used to simulate a rolling pass. Comparison of computed and experimental results shows some differences but this model can reproduce microstructural changes qualitatively.
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Christophe Castan. Etude de la recristallisation au cours du laminage a chaud d’aciers a basse densite fer-aluminium. Autre. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. Français. ⟨NNT : 2011EMSE0629⟩. ⟨tel-00721834⟩

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