Dr Charles-André Gandin - CEMEF, France
Dr Charles-André GANDIN is Research Director with the French National Centre for Scientific Research (CNRS). He works at the Centre for Material Forming (CEMEF) of MINES ParisTech (Sophia Antipolis, France). His fields of research are solidification processing, microstructure, segregation, including modelling and coupling with thermodynamics, as well as solid state transformations and properties during subsequent metallurgical transformations.
He received an engineer diploma in 1990 (Institut National Polytechnique de Grenoble, France), a research doctorate in 1995 (Ecole Polytechnique Fédérale de Lausanne, Switzerland) and a research habilitation in 2007 (Institut National Polytechnique de Lorraine, France).
He has authored and co-authored more than 60 journal papers and 90 proceedings papers showing collaborations with colleagues in Brazil, Canada, China, France, Germany, Ireland, Japan, Norway, Spain, Switzerland, United Kingdom, United States of America.
3D Multiscale Modelling of Solidification Structures
Ch. A. Gandin, A. Saad, S. Chen, G. Guillemot and M. Bellet
MINES ParisTech CEMEF, France
Microstructure modelling can only be relevant if it is conducted in 3D. This is particularly true when considering diffusion and convection transports around/through complex geometries, texture evolution, or mechanical response to various solicitations. Moreover, large simulations must be considered in order to integrate microstructure modelling in a domain size that is representative of the process, or to make the link between several microstructure modelling methodologies developed for applications at different scales.
This contribution will present recent efforts to systematically make use of 3D parallel computation of microstructures. The advantage of automatic adaptation of anisotropic finite element mesh is demonstrated in this context, as well as dynamic allocation strategies for a cellular automaton method. Applications will include computations of dendritic grain structures by tracking the solid-liquid interface  or its envelope (illustration given in Figure 1), formation of freckles during directional solidification (illustration given in Figure 2), macrosegregation , as well as grain structures in welding processing .
|Figure 1. Simulated grain envelope of an isolated dendritic grain growing in an undercooled melt of succinonitrile - 0.5 mol% acetone alloy (inspired from Melendez and Beckermann, J. of Cryst. Growth 340 (2012) 175)||Figure 2. Simulated isosurfaces of Ga composition (coloured contours) and convection field (arrows and stream lines) formed during directional solidification in a thin 3D cell of an In 75wt%Ga alloy (inspired from Shevchenko et al., Metall. Mater. Trans. 44A (2013) 3797)|
- Proceedings of this conference
- T. Carozzani, Ch. A. Gandin, H. Digonnet, M. Bellet, K. Zaidat, Y. Fautrelle, Metallurgical and Materials Transactions A, 44 (2013), 873-887
- S. Chen, G. Guillemot, Ch. A. Gandin, ISIJ international, 54 (2014), in press