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Comportement mécanique des aciers TRIP

Published online by Cambridge University Press:  28 September 2005

Marcel Berveiller
Affiliation:
Laboratoire Physique et Mécanique des Matériaux (LPMM), UMR 7554 CNRS – Université de Metz – ENSAM, 4 rue Augustin Fresnel, 57050 Metz Cedex, France
Mohammed Cherkaoui
Affiliation:
Laboratoire Physique et Mécanique des Matériaux (LPMM), UMR 7554 CNRS – Université de Metz – ENSAM, 4 rue Augustin Fresnel, 57050 Metz Cedex, France
Étienne Patoor
Affiliation:
Laboratoire Physique et Mécanique des Matériaux (LPMM), UMR 7554 CNRS – Université de Metz – ENSAM, 4 rue Augustin Fresnel, 57050 Metz Cedex, France
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Abstract

Les aciers TRIP présentent une ductilité élevée et une forte résistance. Cette propriété remarquable trouve son origine dans la transformation martensitique de l'austénite. Ce comportement est modélisé avec une approche par transition d'échelle en utilisant le cadre de la thermomicromécanique pour déterminer les forces motrices ainsi que les lois de germination et de croissance qui contrôlent l'évolution de la microstructure. La présence de frontières mobiles et la discontinuité du champ de déformation au passage de ces interfaces sont prises en compte dans l'écriture des équations de champs. On montre que le champ de contrainte interne associé à la transformation se compose d'une contribution à longue distance responsable de la sélection des variantes et d'une contribution locale liée à la morphologie des microdomaines et au mode de croissance. On utilise une approche cristallographique à variables internes pour déterminer ces contributions. L'utilisation d'un modèle auto-cohérent classique permet ensuite de décrire le comportement global. Les résultats numériques obtenus sont comparés avec les données expérimentales pour un alliage FeNi et un acier TRIP 0,2C-1,5Si-1,5Mn élaboré par l'IRSID.

Type
Research Article
Copyright
© AFM, EDP Sciences, 2004

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References

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