| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Agile Additive Manufacturing by Employing Breakthrough Functionalities
|
| Presentation Title |
Grain Nucleation From Cavitation Instabilities Induced by Nanosecond Laser Irradiation in Additive Manufacturing Melt Pools |
| Author(s) |
Michael J J. Abere, Hannah Sims, Levi Van Bastian, Hyein Choi, Jonathan W Pegues |
| On-Site Speaker (Planned) |
Michael J J. Abere |
| Abstract Scope |
Local control over grain structure is essential for fabricating additively manufactured parts with targeted site-specific properties. The inclusion of multi-modal manufacturing strategies enables printing of microstructures not possible with only process optimization. One approach involves integrating ultrasound to produce melt pool cavitation instabilities achieving a columnar-to-equiaxed transition in the material. However, the technique is difficult to scale to larger parts. This work utilizes a nanosecond laser integrated onto a wire feed additive manufacturing tool to utilize the elastic waves generated by local ablation within the melt pool to produce cavitation instabilities. The resulting grain refinement was characterized in electron backscatter diffraction and shown to be localizable to the nanosecond laser spot within the melt. Calculations using the Fabbro model were used to compare laser elastic wave pressures to those in ultrasound-based methods of grain refinement. Sandia National Laboratories is managed and operated by NTESS under DOE NNSA contract DE-NA0003525 |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Solidification, Process Technology |