| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Microstructure, Defects, and Properties
|
| Presentation Title |
Probing the Balling Boundary in Laser Powder Bed Fusion: Are Single Bead Experiments Enough? |
| Author(s) |
Junwon Seo, Sarah Birchall, Bryan Webler, Anthony Rollett |
| On-Site Speaker (Planned) |
Junwon Seo |
| Abstract Scope |
As the industry moves towards fabricating larger-scale components with laser powder bed fusion (LPBF), the productivity of the process becomes more significant. Leveraging a higher laser power (P) with a faster scanning velocity (V) increases productivity, however, this may induce balling defects in the part. Researchers generally examine single beads printed at the high P-V regime to identify the boundary at which the balling defect starts to occur. However, our results show that the balling boundary is heavily affected by other variables such as the presence of previous hatch scans and the powder quality. Ex-situ tomography experiments are used to quantify the location and the shift in the balling defect formation boundary in single-bead and multiple-track scanning experiments with various SS316L powders. We attempt to understand the phenomena by decoupling the effects of each variable in the experiment to provide a better methodology for identifying the balling boundary in LPBF. |