| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
Enabling Microstructure Manipulation in Laser Powder Blown Directed Energy Deposition through Multi-mode Laser Beam Shaping |
| Author(s) |
Samantha Webster, James Zuback, Annabel Shim, Carelyn Campbell |
| On-Site Speaker (Planned) |
Samantha Webster |
| Abstract Scope |
Laser powder-blown directed energy deposition (DED-LB) has become known for its flexibility in geometry and materials, demonstrated by its propensity for 5-axis fabrication, functionally graded materials, and repair applications. During deposition of material, the laser beam shape directly affects the temperature distribution across the melt pool. In turn, grain growth and resulting microstructure can be manipulated by utilizing different laser beam shapes. To better understand the relationship between beam shape and microstructure in DED-LB, SS17-4 material was deposited using a multi-mode laser with both Gaussian and Ring mode laser distributions (nLight AFX-1000). Seven modes were investigated where the power ratio between the Gaussian mode and Ring mode was varied from 0/100 to 90/10. Resulting material structure was investigated using optical imaging and Electron Backscatter Diffraction (EBSD) to connect process changes to microstructure, and implications of using a multi-mode laser for DED processing at the industrial scale will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Process Technology, Iron and Steel |