About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging for Materials Science and Processing
|
| Presentation Title |
High-Speed Visualization of Laser-Melt Interactions with Beam Oscillation and Shaping |
| Author(s) |
Anthony D. Rollett, Junwon Seo, Amaranth Karra, Bryan Webler, Guannan Tang, Gabe Guss, Thejaswi Tumkur, Kalia Bertsch |
| On-Site Speaker (Planned) |
Anthony D. Rollett |
| Abstract Scope |
We report on findings by a multi-disciplinary/institution team on the use of laser beam oscillation and spot shaping to modify liquid flow and microstructure with high-speed operando visualization with synchrotron x-rays at two 4th generation light sources. Tungsten (W) particles were employed as tracers to visualize the flow in the melt pool by observing their distribution on the Al-10Si-Mg. Differences were found in the coaxial photodiode (cPD) signal between a Gaussian sport versus a Bessel beam. There were also strong differences in keyhole porosity formation with the Bessel beam yielding lower rates, which is rationalized by there being higher peak temperatures in a Gaussian spot with consequent stronger Marangoni flow. Similarly, we have observed more uniform fluid flow with oscillation of the beam than without. As 3D printers are increasingly equipped with beam shaping capability, such observations promote improved understanding of the effects. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Solidification |