3D simulations of microstructure and comparison with experimental microstructure coming from O.I.M analysis

L. ST-PIERRE; EVA HERIPRE; MARIE DEXET; JEROME CREPIN; GRACIELA BERTOLINO; NICOLAS BILGER

INTERNATIONAL JOURNAL OF PLASTICITY

Elsevier

Lugar: Amsterdam; Año: 2008 vol. 24 p. 1516 - 1532

0749-6419

   This paper presents a new methodology to create realistic 3D microstructures of polycrystals. Thevirtual microstructures are based on statistical data describing the morphological and crystallo-graphic textures of a sample, obtained from an EBSD analysis. In addition, the methodology canreproduce the observed surface on top of the simulated microstructure. This feature allows finite ele-ment calculations on these virtual aggregates to be compared to experimental results of mechanicaltests. Such a comparison leads to the identification of the mechanical parameters of constitutivelaws, such as critical resolved shear stress and strain hardening, using an optimization algorithm.Two materials were simulated in this study: TiAl and grade 702 zirconium. The first one presentstwins inside the microstructure and the second one has an anisotropic texture. Based on 2D simula-tions, the important parameters necessary to describe a microstructure were identified as grain size,