|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Solidification Processing of Light Metals and Alloys: An MPMD Symposium in Honor of David StJohn
||Prediction of the Columnar to Equiaxed Transition in Bottom Cooled Aluminum Copper Cylinders
||Thomas, J. Williams, Christoph Beckermann
|On-Site Speaker (Planned)
Predicting the columnar to equiaxed transition (CET) in the presence of convection is still a challenging task. Here, casting experiments of bottom cooled aluminum cylinders with 4, 10, and 18 wt. % copper composition are simulated including CET prediction. In these experiments, the different solute concentrations result in the formation of equiaxed grains which are either lighter, heavier, or neutrally buoyant compared to the surrounding melt. In order to model the experiments, a casting simulation that considers the thermal environment of the surrounding furnace is used to obtain spatiotemporally varying temperature gradient boundary conditions along the cylinder. These boundary conditions are then applied to a three phase volume averaged solidification model to predict CET in the presence of melt convection in the cylinder. Model predictions are found to agree with experimental results.