| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Solidification in External Fields
|
| Presentation Title |
Microstructure Control in Additive Manufacturing Using Magnetic Fields and Strategic Scanning |
| Author(s) |
Ivars Krastins, Xianqiang Fan, Catherine Tonry, Peter Soar, Koulis Pericleous, Peter D. Lee, Andrew Kao |
| On-Site Speaker (Planned) |
Ivars Krastins |
| Abstract Scope |
The use of magnetic fields in laser additive manufacturing leads to thermoelectric magnetohydrodynamics (TEMHD). This phenomenon takes place in meltpools where the applied magnetic field interacts with the thermoelectric currents generated by large temperature gradients and induces flow. The melt flow governs the heat and mass transport and impacts the meltpool morphology. Scanning strategy can also modify the meltpool dynamics and solidification microstructure. To explore these phenomena a bespoke numerical code TESA (ThermoElectric Solidification Algorithm) has been employed. It is a parallel multiscale code that uses the Cellular Automata and Lattice Boltzmann methods. The results show that the numerical model can capture the competition between the TEMHD and Marangoni flow resulting in deep and narrow or shallow and wide meltpool shapes. Furthermore, the differences in electric conductivities introduced by the multilayer printing approach lead to asymmetric thermoelectric current formations that further impact the meltpool dynamics and the final alloy microstructure. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Solidification, Additive Manufacturing |