| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
|
| Presentation Title |
Unravelling Particle-Melt Pool Impact Dynamics and In-Flight Laser-Powder Stream Interaction in Laser Directed Energy Deposition Process |
| Author(s) |
Akash Aggarwal, Roland Richter, Jian Yang, Karol Kuglarz, Marc Leparoux, Otto Lippmann, G. Abreu-Faria, Chrisitian Leinenbach |
| On-Site Speaker (Planned) |
Akash Aggarwal |
| Abstract Scope |
This study aims to enhance the understanding of critical phenomena in the Laser Directed Energy Deposition (L-DED) process, focusing on laser-beam shadowing, attenuation, particle-melt pool dynamics, and multi-material dissolution dynamics. Using in-house high-speed visible imaging and photodiode systems, we investigated interactions between the laser, powder stream, and melt pool. High-speed in-situ synchrotron X-ray radiography was also conducted at P61A beamline (PETRA III, DESY Hamburg), using L-DED setup equipped with acoustic and photodiode detectors for real-time monitoring. Additionally, multiphysics modeling with coupled CFD-DEM framework and photon discretization was performed. Our integrated in-situ experiments and modeling provided unprecedented insights into: (1) particle-melt pool surface penetration dynamics, and the influence of Marangoni convection-driven motion, (2) highly oscillatory melt flow from high-speed particle impacts, (3) increased velocities of partially vaporized particles due to recoil pressure, leading to melt pool craters, and (4) inflight laser-particle interactions significantly altering the laser beam, introducing stochasticity and randomness. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Powder Materials, Characterization |