| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Process-induced Microstructures and Defects
|
| Presentation Title |
A Microstructure Study of Multi-Mode Laser Profiles |
| Author(s) |
Austin Tiley, Rakhi Bawa, Amanda Pizon |
| On-Site Speaker (Planned) |
Austin Tiley |
| Abstract Scope |
Additive manufacturing (AM) techniques, particularly laser powder bed fusion (LPBF), are prone to strong columnar growth in the microstructure due to layer-by-layer processing. Traditional LPBF machines utilize gaussian beam geometries to produce their welds. Gaussian beams utilize the intense outward energy gradient to form “U” shape weld pools. This results in a small meltpool ideal for complex high-resolution parts, with a drawback of costly build rates. As a result, newer LPBF machines are integrating beam modification to improve productivity. These different beam geometries have the potential to modify the microstructure of the weld and thus change the material or mechanical properties.To understand the effect of non-gaussian geometry on the microstructure and the resulting properties, the CDME team evaluated an nLight multi-modal laser capable of traditional Gaussian to Ring beam geometries. Outcomes included: understanding parameter development differences between beam modalities, microstructure differences due to solidification modes, and resulting mechanical properties. |
| Proceedings Inclusion? |
Planned: |