|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Solidification Processing of Light Metals and Alloys: An MPMD Symposium in Honor of David StJohn
||Modelling of Shrinkage-induced Species Macrosegregation in A356 Aluminum Wheel Casting
||Pan Fan, Steve Cockcroft, Daan Maijer, Lu Yao, Carl Reilly, Andre Phillion
|On-Site Speaker (Planned)
A numerical model has been developed to study species macrosegregation associated with liquid feeding in the Low Pressure Die Casting of A356 aluminum alloy wheels. The model of the wheel casting process has been implemented within the commercial CFD software package, FLUENTTM using user-defined scalars and corresponding user-defined functions (subroutines) to account for silicon and hydrogen rejection according to the Scheil approximation. The user-defined subroutines were first verified by compareing the model prediction with silicon distribution measured in the wheel casting using an optical, phase area-based technique. The result has shown to be qualitatively correct in predicting trends in silicon segregation and quantitatively accurate within 10 to 30%, depending on the location. The verified user-defined subroutines then was applied to predict hydrogen macrosegregation in the wheel casting. The implications of accounting for species macrosegregation include an improved ability to predict shrinkage porosity, fatigue performance and potentially also hydrogen porosity.