Modélisation par champ de phases de la croissance de la ferrite allotriomorphe dans les aciers Fe-C-Mn

Abstract : The growth of allotriomorphic ferrite plays a major role in the formation of martensite bands in Dual-Phase steels. We have thus developed a phase field model to study the ferritic growth in different ternary Fe-C-X alloys, incorporating two necessary features. First, we have paid a particular attention to recover the different growth regimes due to the huge difference between the diffusion rates of Cand X substitutional species. Our calculations have exhibited a transition from fast paraequilibrium to slow orthoequilibrium in good agreement with experimental measurements in the literature. Second, austenite grain boundaries have been included in the model because they can conterbalance the manganese segregation bands, as shown in our calculations. Indeed, our results show that the bands can be broken bythe wetting of ferrite along the austenite grain boundaries, provided that the segregation is below a threshold value, and provided that the grain boundary energies are sufficiently high
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Alexandre Viardin. Modélisation par champ de phases de la croissance de la ferrite allotriomorphe dans les aciers Fe-C-Mn. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL014N⟩. ⟨tel-01748824⟩

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