| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Symposium
|
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
High Fidelity Model of Directed Energy Deposition: Laser-Powder-Melt Pool Interaction and Effect of Laser Beam Profile on Solidification Microstructure |
| Author(s) |
Saad Khairallah, Eric Chin, Michael Juhasz, Aurelien Perron, Scott Mccall, Joseph Mckeown |
| On-Site Speaker (Planned) |
Saad Khairallah |
| Abstract Scope |
A multiphysics model was developed to reproduce the laser directed energy deposition process to a high-fidelity. This includes resolving the laser-powder-melt pool interactions (powder impingement and incorporation into melt pool, hydrodynamics flow condition and laser absorption inefficiencies) as well as the resulting solidification microstructure. This micrometer scale digital twin captured the details of a grain refinement mechanism caused by high powder flow rate. Furthermore, it was used to explore how laser beam shaping could impact the microstructure. Using a ring laser beam profile instead of the standard Gaussian laser profile, the model predicted a decrease in the thermal gradient which in turn can increase propensity for more desirable equiaxed grains. This work was performed under the auspices of the U.S. Department of Energy (DOE), by Lawrence Livermore National Laboratory (LLNL) under Contract No. DE-AC52-07NA27344. Funding: Laboratory directed research and development project 22-SI-007. IM release LLNL-JRNL-844475. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |