| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
A-137: Phase-field Method for Grain Evolution During Additive Manufacturing |
| Author(s) |
Alexander F. Chadwick, Peter Voorhees |
| On-Site Speaker (Planned) |
Alexander F. Chadwick |
| Abstract Scope |
Models of the solidification process during additive manufacturing are central to predicting the microstructure of the resulting build. Quantitative phase-field models have been successful in studying traditional solidification processing of metals; however, these models typically assume the presence of local equilibrium at the solid/liquid interface which cannot be assumed a priori in rapid solidification. Here, we present a study of phase-field models at velocities where complete solute trapping and absolute stability of planar interfaces occur. We examine the behavior of these models and identify limitations that would either lead to prohibitive computational cost or inaccuracies in the predicted solidification behavior in both the isothermal and nonisothermal regimes. We will present modifications and numerical techniques that ameliorate these limitations. Lastly, we will demonstrate the capabilities of the new model by predicting the preferred crystallographic orientations that arise during powder bed fusion of a polycrystalline structural alloy. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |