Regensburg 2007 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 42: Materials design II
MM 42.1: Vortrag
Freitag, 30. März 2007, 12:30–12:45, H16
A coupled meso-macro-scale simulation of solidification in Al-Cu alloys — •Ivaldo Leao Ferreira1, Britta Nestler1, and Amauri Garcia2 — 1Institute for Computational Engineering, Karlsruhe University of Applied Sciences, Karlsruhe, Germany — 2Fac. Engenharia Mecanica, UNICAMP, Brasil
The macroscopic heat transfer modelling associated to fluid flow is frequently used in prediction of ingots defects, while mesoscopic modelling is applied for the studies of alloy changes in relation to a typical microstructure. By combining a meso-scale model for the extraction of local alloy concentrations and a macro-scale model able to predict temperature, solute concentration, velocity fields and pressure profiles, it is possible to conduct cast process simulations for a large range of space and time scales. An extension of a 2D macro-scale model proposed for predicting inverse macrosegregation profiles during solidified alloy ingots is coupled with a meso-scale phase-field model for simulating microstructure formation processes. The phase-field model can provide parameters such as the phase fractions, primary/secondary arm spacings and microsegregation profiles. The approach will help to understand the effects exerted by the kinetics of solidification on the form of microstructure and consequently on microsegregation and macrosegregation profile in ingots or casting parts in commercially available alloys.