Modelling of solidification and heat treatment for the prediction of yield stress of cast alloys

Charles-André Gandin (1) , Yves Brechet (2) , Michel Rappaz (3) , Gilles Canova (4) , Michael Ashby (5) , Hugh Shercliff (5)

1 LSG2M - Laboratoire de Science et Génie des Matériaux et de Métallurgie
2 LTPCM - Laboratoire de thermodynamique et physico-chimie métallurgiques
3 Laboratoire de Métallurgie Physique
4 GPM2 - Génie physique et mécanique des matériaux
5 Department of Chemical Engineering - University of Cambridge

A model is developed for the prediction of the microstructure evolution of cast alloys during its industrial process route. The materials under consideration are binary aluminium-copper alloys. The process are casting, homogenising and ageing. A suite of models is built, which successively calculates microsegregation taking place duríng solidification and homogenisation, and precipitation occurring during ageing of the alloy. As a final output, the model permits the final yield stress of the material to be calculated as a function of the process parameters (i.e., casting cooling rate, inoculation of the alloy, duration and temperature of the homogenising and ageing heat treatments). This is made possible by introducing a structural hardening model between the diffusion driven phase transformation models and a final mechanical model for heterogeneous materials.

Mots clés: solidification; thermal treatment; Fondery

Domaines: Matériaux

Charles-André Gandin, Yves Brechet, Michel Rappaz, Gilles Canova, Michael Ashby, et al.. Modelling of solidification and heat treatment for the prediction of yield stress of cast alloys. La Metallurgia Italiana, 2002, 3, pp.37-38. ⟨hal-01570149⟩