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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology: Fundamentals of Aluminum Alloy Solidification Joint Session
Presentation Title Impact of Inlet Flow On Macrosegregation Formation Accounting for Grain Motion and Morphology Evolution in DC Casting Of Aluminium
Author(s) Akash Pakanati, Knut Omdal Tveito, Mohammed M'Hamdi, Hervé Combeau, Miha Založnik
On-Site Speaker (Planned) Akash Pakanati
Abstract Scope Several transport mechanisms contribute to macrosegregation formation in Direct Chill (DC) casting of aluminium. The latter include solidification shrinkage induced flow, thermal-solutal convection and grain motion. The relative importance of these transport mechanisms depends on process parameters such as cast velocity, inlet melt flow, cooling rate, cast dimensions etc. Of these, the inlet melt flow due to vertical jet is known to cause significant modification in macrosegregation by resuspending equiaxed grains at the center of the ingot/billet. In this paper, we investigate by means of modeling the macrosegregation formation due to an inlet vertical jet. For this purpose, a three-phase, multiscale solidification model accounting for above mentioned transport phenomena except for shrinkage induced flow is applied on a DC cast billet. The model considers grain motion accounting for both globular and dendritic equiaxed grain growth and we investigate their interaction with the inlet vertical jet. We show that an interplay of morphology evolution of equiaxed grains and inlet vertical jet together contribute to grain resuspension which in turn modifies macrosegregation formation. We also compare these results with a case with open inlet.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

An Investigation on Si Refinement Mechanism of Hypereutectic Al-Si via Applying Ultrasonic Vibrations
C-45: Homogenization Treatment of High-strength Aluminum Alloy with Casting Processes
Effective Nanoparticles Feeding Treatment in Casting of A356/ZrO2 Nano-reinforced Composite
Effects of Microstructure on Hot Cracking Behavior in Al-Zn-Mg-Cu Alloys
Impact of Inlet Flow On Macrosegregation Formation Accounting for Grain Motion and Morphology Evolution in DC Casting Of Aluminium
In-situ Study of Solidification Kinetics of Al-Cu and Al-Ce Alloys with Application of Neutron Diffraction
Observations of Microhardness and Segregation in Al-Zn and Zn-Al Specimens with Columnar-to-Equiaxed Grain Transition
Quantifying Effects of Grain Refiner Addition on Fe-rich Intermetallics Solidification of Al-Si-Cu Alloys Using In Situ Synchrotron X-ray Tomography

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