About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Materials Design and Processing Optimization for Advanced Manufacturing: From Fundamentals to Application
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Presentation Title |
Predicting the Columnar-to-equiaxed Transition during Additive Manufacturing of Concentrated Multicomponent Alloys |
Author(s) |
Christopher A. Hareland, Gildas Guillemot, Oriane Senninger, Charles-André Gandin, Peter Voorhees |
On-Site Speaker (Planned) |
Christopher A. Hareland |
Abstract Scope |
The solidification structures that form during processing dictate the properties of additively manufactured (AM) components. For example, the columnar-to-equiaxed transition (CET), describes a shift from columnar to equiaxed grains, which improves resistance to hot-tearing during processing and the final mechanical properties of the component. Existing analytical models of the CET are limited by dilute-solution models of dendritic growth that poorly describe the behavior of concentrated multicomponent alloys. Here, we use a dissipation relation incorporating solute drag to determine the interfacial response functions and find that the partition coefficient depends on the degree of drag in the system. This result is used in an interfacial stability analysis to determine the tip radius for dendritic solidification. With CALPHAD free energies, this model of dendritic growth can be used within a CET model to improve calculations of the processing conditions required to observe the CET during the AM of modern, technologically relevant alloys. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Solidification, Modeling and Simulation |