About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Additive Manufacturing of Metals: Applications of Solidification Fundamentals
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Presentation Title |
Testing Analytic Models and Heuristics for Microstructure Evolution with 3D, Dendrite-resolved Phase-field Simulations of Entire Spot Melts |
Author(s) |
Stephen J. DeWitt, Christopher Newman, Stephen Nichols, Jean-Luc Fattebert, Balasubramaniam Radhakrishnan, John Coleman, Gerry Knapp, James Belak, John Turner |
On-Site Speaker (Planned) |
Stephen J. DeWitt |
Abstract Scope |
During additive manufacturing, microstructure evolution at the grain and dendrite scales is complicated by rapid changes in solidification conditions and the melt pool geometry. Analytical models and heuristics based on fundamental solidification theory are commonly applied in additive manufacturing contexts; however, the limits of their applicability are not fully understood. Here, we present a series of 3D, full melt pool, dendrite-resolved phase-field simulations of spot melts to examine the accuracy of such analytical models and heuristics. These simulations provide a full 3D history of microstructure evolution where the thermal conditions are precisely known, which facilitates direct comparisons that cannot be obtained using current experimental methods. In the sub-grain solidification microstructure, we focus on examining planar-cellular-dendritic transitions and primary spacings. In the grain structure, we focus on columnar-equiaxed transitions and grain selection.
This abstract has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Computational Materials Science & Engineering, Solidification |