|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||CFD Modeling and Simulation in Materials Processing
||Microporosity Prediction in Aluminium DC Casting
||Laurent Heyvaert, Hervé Combeau, Miha Založnik, Philippe Jarry, Emmanuel Waz
|On-Site Speaker (Planned)
The SOLID 2D model of transport phenomena occurring in the sump of a DC cast product has been used to investigate the interaction between macrosegregation and porosity. The model accounts for diffusion controlled growth of the pores and for their interactions with the growing microstructure. These predictions have been compared with high resolution ultrasonic characterization as well as micrographs performed on a DC cast high Mg 5xxx Al alloy sheet ingot. The model accounts for the fact that the maximum porosity defects are not located at mid-thickness of the product and demonstrates that this distribution can be explained by the limited diffusion of hydrogen in the liquid. The model also suggests that if the number of nucleated pores is sufficiently small, the liquid can remain supersaturated in hydrogen during the whole solidification time and the growth of the pores remains limited.
||Planned: A print-only volume