Impact of intragranular microstructure development on ductility limits of multiphase steels

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:528

Article

Franz, Gerald²  Abed-Meraim, Farid¹  Ben Zineb, Tarak³  Lemoine, Xavier^1,4  Berveiller, Marcel¹ 

[1] Arts & Metiers ParisTech, CNRS, UMR 7239, LEM3, F-57078 Metz 3, France

[2] IUT Amiens, EA 3899, LTI, F-80025 Amiens 1, France

[3] Nancy Univ, CNRS, UMR 7563, LEMTA, F-54500 Vandoeuvre Les Nancy, France

[4] ArcelorMittal Global R&D, F-57283 Maizieres Les Metz, France

关键词: Micromechanics;    Crystal plasticity;    Self-consistent scale-transition;    Intragranular substructure;    Ductility;    Plastic instability;   

DOI  :  10.1016/j.msea.2011.01.042

来源: Elsevier

【 摘 要 】

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. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

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