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Impact of intragranular microstructure development on ductility limits of multiphase steels

Article dans une revue avec comité de lecture
Author
FRANZ, Gérald
39101 Laboratoire des technologies innovantes - UR UPJV 3899 [LTI]
BEN ZINEB, Tarak
LEMOINE, Xavier
BERVEILLER, Marcel
ccABED-MERAIM, Farid 
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]

URI
http://hdl.handle.net/10985/10107
DOI
10.1016/j.msea.2011.01.042
Date
2011
Journal
Materials Science and Engineering: A

Abstract

In this paper, the effects of microstructure and deformation mechanisms on the ductility of multiphase steels are investigated. To this end, 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 spatially heterogeneous distribution of dislocations inside the grain is represented by three types of local dislocation densities. 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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