|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||2018 Technical Division Student Poster Competition
||SPG-21: A General Multiphase Model for Macrosegregation and Columnar to Equiaxed Transition in Alloy Solidification
||Mahdi Torabi Rad, Christoph Beckermann
|On-Site Speaker (Planned)
||Mahdi Torabi Rad
In metal casting, simultaneous prediction of macrosegregation and columnar to equiaxed transition (CET) is still an important challenge. One of the open questions is the role of melt convection in CET and the effect of CET on macrosegregation. We have developed a general multiphase model for macrosegregation and CET. This model uses state of the art accurate constitutive relations that we have established for equiaxed solidification using simulation results from a previously developed mesoscopic envelope model. The general model is used to develop sub-models for macrosegregation in the absence and presence of primary dendrite tip undercooling. Finally, we validated the model by simulating a benchmark solidification experiment involving tin-lead alloys. The predicted cooling curves, macrosegregation patterns, channel segregates and CET lines are found to be in good agreement with the experimental measurements.