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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Frontiers in Solidification Science and Engineering
Presentation Title Numerical Investigation Of Macrosegregation Mechanisms In DC Casting for Different Alloy Systems
Author(s) Akash Pakanati, Mohammed M'Hamdi, Hervé Combeau, Miha Založnik
On-Site Speaker (Planned) Akash Pakanati
Abstract Scope Macrosegregation formation in Direct Chill (DC) casting of aluminum alloys is a subtle interplay of various transport mechanisms – solidification shrinkage induced flow, thermal-solutal convection and grain motion. In this paper, we attempt to qualitatively study the relative impact of these transport mechanisms on the final macrosegregation formation by considering three different binary alloy systems: Al-Mg, Al-Cu and Al-Zn. A multiphase, multiscale solidification model based on volume averaging method accounting for above mentioned transport phenomena is used and applied to an industrial scale DC cast ingot to conduct this study. Simulation results of macrosegregation formation due to individual transport mechanisms and in combination for each alloy system is presented. Based on this, we show that the contributing phenomena for negative segregation commonly observed in the center of the ingot depends on the type of alloy element used.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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