| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging
|
| Presentation Title |
Correlating Laser Process Conditions to Balling Severity with Time-resolved Synchrotron X-ray Visualization |
| Author(s) |
Anthony D. Rollett, Runbo Jiang, John V Smith |
| On-Site Speaker (Planned) |
Anthony D. Rollett |
| Abstract Scope |
The productivity of Laser Powder Bed Fusion (LPBF) relies on laser power and travel speed. Scaling the laser melting conditions to achieve higher productivity, i.e., raising power and speed together, results in “balling up” of the melt pool and consequent porosity. Understanding the limits of the balling phenomenon has the potential to increase productivity while limiting defect formation. We used synchrotron Dynamic X-Ray Radiography (DXR) to visualize melt pool conditions in nickel alloy 718. CT scans of melt pools allow for continuous cross sections of samples to be analyzed. The results were as follows. Melt pools become unstable and difficult to predict over 450 W; also, significant variance occurred when the laser system was changed. Statistical models have the potential to be used to predict when balling will occur under given laser conditions. This knowledge can be used to increase productivity of laser fabrication processes. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, |