| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
Tailoring the Microstructure of AA6061 Using Pulsed Laser in Powder Bed Fusion |
| Author(s) |
Sivaji Karna, Tianyu Zhang, Can Sun, Andrew J. Gross, Daniel Morrall, Timothy Krentz, Dale Hitchcock, Lang Yuan |
| On-Site Speaker (Planned) |
Sivaji Karna |
| Abstract Scope |
In this study, we investigate the use of a pulsed laser in powder bed fusion for tailoring grain structures in AA6061. The relationships of pulsed laser parameters, namely frequency and duty cycle, and the resulting microstructure were examined through quantifications of melt pool boundaries, grain size and texture, subgrain and precipitates, and mechanical properties. Our findings reveal that microstructure formation is closely linked to remelting cycles during pulsing. Lower frequencies or duty cycles result in a higher number of melt pool boundaries within a single melt track, promoting finer grain and subgrain structures. In contrast, higher frequencies and duty cycles reduce cooling rates by maintaining the temperature above the liquidus during pulsing, leading to coarser grains. By optimizing pulsing strategies to control remelting cycles and total energy input, tailored microstructures can be achieved for desired material properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |