| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing: Materials, Alloy Development, Microstructure and Properties
|
| Presentation Title |
Characterization of the Balling Ddefect during Laser Powder Bed Additive Manufacturing |
| Author(s) |
Debomita Basu, Jack Beuth, Bryan Webler |
| On-Site Speaker (Planned) |
Debomita Basu |
| Abstract Scope |
A major challenge of adopting Laser Powder Bed Fusion into an industrial setting is the relatively slow build rates characteristic of this process. While using higher laser powers and velocities increase the build rate, undesirable surface tension defects known as the balling phenomenon, or bead-up, may form along the length of the laser track. This creates uneven surfaces for subsequent layers, which can result in embedded pore-type flaws. The exact parameters at which this phenomenon occurs are not the same across different metals. In this work, 316 Stainless Steels and Ti-6Al-4V were studied to determine differences in balling behavior using optical microscopy, scanning electron microscopy, high-speed radiography, high speed imaging, and IR imaging. However, the formation mechanisms behind this defect are relatively unknown. Possible processing strategies to change melt pool shape at high powers and high velocities and mitigate balling are also discussed. |