Impact of Intragranular Substructure Parameters on the Forming Limit Diagrams of Single-Phase B.C.C. Steels

Gérald Franz (1) , Farid Abed-Meraim (2, 3) , Marcel Berveiller (3)

1 LTI - Laboratoire des technologies innovantes - UR UPJV 3899
2 Labex DAMAS
3 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux

An advanced elastic-plastic self-consistent polycrystalline model, accounting for intragranular microstructure development and evolution, is coupled with a bifurcation-based localization criterion and applied to the numerical investigation of the impact of microstructural patterns on ductility of single-phase steels. The proposed multiscale model, taking into account essential microstructural aspects, such as initial and induced textures, dislocation densities, and softening mechanisms, allows us to emphasize the relationship between intragranular microstructure of B.C.C. steels and their ductility. A qualitative study in terms of forming limit diagrams for various dislocation networks, during monotonic loading tests, is conducted in order to analyze the impact of intragranular substructure parameters on the formability of single-phase B.C.C. steels.

Mots clés: BCC materials; Multiscale model; Crystal plasticity; Forming limit diagrams; Bifurcation analysis; Intragranular substructure; BCC materials

Domaines: Matériaux; Sciences de l'ingénieur [physics]; Mécanique [physics]; Mécanique des solides [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Génie mécanique [physics.class-ph]

Gérald Franz, Farid Abed-Meraim, Marcel Berveiller. Impact of Intragranular Substructure Parameters on the Forming Limit Diagrams of Single-Phase B.C.C. Steels. Materials, 2013, 6 (11), pp.5217-5233. ⟨10.3390/ma6115217⟩. ⟨hal-01502163⟩