Prédiction de la taille et de la composition des inclusions dans une poche d'acier liquide : étude numérique

Abstract : The steel quality is an important focus for ArcelorMittal. The presence of inclusions in the form of precipitates of different composition can produce defects in the slab (exfoliation) which can affect rolling operations and giving a poor surface sheet of steel. To provide actuators for efficient removal of these inclusions, we must first know the phenomena that govern their birth and their lives. The objective of this thesis is to understand and to predict the stages of germination / growth of solid inclusions present in liquid steel. In this context, a numerical tool has been implemented. It takes into account not only the mechanics of fluid through the use of Fluent® but also thermodynamics with a homemade tool called MIPPHASOLACIDO and an inclusions population size tracking with a new method based on the work of Marchisio et al. (2004). Multi-QMOM is an elegant tool built with a finite number of QMOM (Quadrature Method Of Moments) used to monitor changes of population size. It represents the major innovation of this thesis. The numerical tool whose results were compared to analytical and industrial cases can model the phenomena of precipitation, growth, aggregation and extraction of various solid inclusions. It allows the study of different parameters and their impacts on inclusions population.
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Laurent Claudotte. Prédiction de la taille et de la composition des inclusions dans une poche d'acier liquide : étude numérique. Autre [cond-mat.other]. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10020⟩. ⟨tel-01748207⟩

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