About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing of Metals: Applications of Solidification Fundamentals
|
Presentation Title |
Modeling Non-Equilibrium Partitioning in Concentrated Cu-Fe Alloys Manufactured by Laser Powder-fed Directed Energy Deposition |
Author(s) |
Daniel Yin, Amit Misra |
On-Site Speaker (Planned) |
Daniel Yin |
Abstract Scope |
Laser powder-fed directed energy deposition (DED-LB) produces high cooling rates within a small melt pool which can lead to high amounts of solute trapping during solidification. In this work, we test concentrated Cu-Fe alloys which are homogenous in the liquid phase and normally have negligible solid solubility at room temperature. A numerical model is used to quantify the solute trapping defined as the degree of non-equilibrium partitioning. Simulations were run to match the as-printed samples’ DED-LB processing parameters. Composition characterization by WDS and STEM-EDS confirmed high amounts of solute trapping in the form of nanoprecipitates in both the Cu and Fe grains, a nanoscale hierarchical microstructure with yield strengths much higher than Hall-Petch predicted strengthening. Our model produced good agreement with the measured Cu solute concentrations in the Fe grains but overpredicts the Fe solute concentration in the Cu grains due to deviation in the solidified phase fractions from equilibrium. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Modeling and Simulation, Solidification |