| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Powder Materials Processing and Fundamental Understanding
|
| Presentation Title |
The Effects of Melt Pool Geometry on Microstructure Development during Additive Manufacturing |
| Author(s) |
Alexander F. Chadwick, Peter W. Voorhees |
| On-Site Speaker (Planned) |
Alexander F. Chadwick |
| Abstract Scope |
During additive manufacturing, the geometry of the melt pool has a profound impact on the developed microstructure, particularly for epitaxial growth of columnar grains. Here, we compare the predicted microstructures with Rosenthal and Eagar-Tsai solutions for the temperature field. We present results from two models: a polycrystalline phase-field model with anisotropic, nonequilibrium solidification kinetics, and a novel model that considers how individual trijunctions follow the liquidus isotherm. Despite the assumption of isotropy, the empirical model predicts grain boundary trajectories, and thus grain shapes, that are in excellent agreement with the phase-field. For melt pools with similar sizes, both models predict that the Rosenthal and Eagar-Tsai solutions lead to fundamentally different grain shapes. In particular, the Eagar-Tsai model gives many more small grains following solidification than the Rosenthal model. The implications of this result are also discussed in regard to the effects of scan strategy. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Computational Materials Science & Engineering, Modeling and Simulation |