| About this Abstract |
| Meeting |
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
| Symposium
|
2024 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2024)
|
| Presentation Title |
Dual-laser L-PBF Microstructural Tuning via Physics-based Feedforward Control |
| Author(s) |
Nathaniel Wood, Andrew Gillman, Edwin Schwalbach , Sean Donegan, Chinedum Okwudire |
| On-Site Speaker (Planned) |
Nathaniel Wood |
| Abstract Scope |
A major deficiency of Laser Powder Bed Fusion (PBF) is its inability to sculpt engineering features like microstructure throughout the build like electron beam (EB) PBF, which is because the EB can realize scans the laser cannot. In this work, we mimic an EB scan in a dual-laser PBF system to constrain temperatures in the layer to be within the phase transition region of 316L SS, thus promoting an equiaxed structure that is normally achievable only by post-process heat treatments. Our dual-laser scan is based on one laser (the melting laser) following the nominal, slicer-derived scan path and the second (the heating laser) rapidly moving behind it to regularize temperatures and slow down cooling. The heating laser’s movements are scheduled by a greedy algorithm that uses a fast and accurate thermal model to choose the move which drives forecasted temperatures the closest to the middle of the transition region. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |