About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Real Time Imaging for Materials Science and Processing
|
| Presentation Title |
Revealing mechanisms of processing defect mitigation in laser powder bed fusion via shaped beams using high-speed X-ray imaging |
| Author(s) |
Jiandong Yuan, Qilin Guo, Samuel Clark, Luis Escano, Ali Nabaa, Minglei Qu, Junye Huang, Qingyuan Li, Allen Jonathan Roman, Tim Osswald, Kamel Fezzaa, Lianyi Chen |
| On-Site Speaker (Planned) |
Jiandong Yuan |
| Abstract Scope |
Laser powder bed fusion (LPBF), utilizing a Gaussian-shaped beam, faces challenges, including pore formation, melt pool fluctuation and liquid spattering. While beam shaping has emerged as a potential approach, the shaped beam-matter interaction dynamics remain unclear. Here, we directly observe ring-shaped beam-matter interaction dynamics and unveil defect mitigation mechanisms in ring-shaped beam LPBF. By spatially manipulating incident laser rays, the ring-shaped beam controls keyhole morphology, thereby managing the distribution of the reflected rays. This manipulation can effectively eliminate the formation of an unstable cavity at the keyhole tip, stabilizing the keyhole and mitigating keyhole pores. This keyhole stability effectively reduces melt pool fluctuations and spattering from liquid breakup and droplet collisions. Additionally, the high-energy forefront of the ring-shaped beam effectively melts the powder bed, reducing agglomeration liquid spatter. These findings may guide the design of beam shaping strategies for simultaneously increasing the quality and productivity of metal additive manufacturing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, |