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Impact of microstructural mechanisms on ductility limits

Communication avec acte
Author
FRANZ, Gérald
39101 Laboratoire des technologies innovantes - UR UPJV 3899 [LTI]
ccABED-MERAIM, Farid
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
BEN ZINEB, Tarak
441232 Laboratoire d'Energétique et Mécanique Théorique et Appliquée [LEMTA ]
LEMOINE, Xavier
36484 ArcelorMittal Maizières Research SA
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
BERVEILLER, Marcel
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]

URI
http://hdl.handle.net/10985/10108
Date
2011

Abstract

In order to investigate the effects of microstructure and deformation mechanisms on the ductility of multiphase steels, a formability criterion based on loss of ellipticity of the boundary value problem is coupled with an advanced multiscale model accounting for intragranular microstructure development and evolution. The resulting large strain elastic–plastic single crystal constitutive law (based on crystal plasticity) is incorporated into a self-consistent scale-transition scheme. The present contribution focuses on the relationship between the intragranular microstructure of B.C.C. steels and their ductility. The model allows interesting comparisons in terms of formability limits for different dislocation networks, during monotonic loading tests applied to polycrystalline aggregates.

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