| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Microstructural Evolution and Material Properties Due to Manufacturing Processes: A Symposium in Honor of Anthony Rollett
|
| Presentation Title |
Understanding Dislocation Cell Structure in a Coni-Based Superalloy Fabricated by Laser Powder Bed Fusion |
| Author(s) |
James Lamb, Nicolo della Ventura, McLean Echlin, Tresa Pollock |
| On-Site Speaker (Planned) |
James Lamb |
| Abstract Scope |
The local structure of dislocation cells that develop during laser powder bed fusion (LPBF) in a CoNi superalloy, GP-700, inform the solidification process during printing. High-angular resolution electron backscattered diffraction (HR-EBSD) collected using a monolithic direct electron detector captures both intracellular and intercellular rotations and distribution of geometrically necessary dislocation densities. Dislocation cells are observed to transition between orthogonal growth directions across melt pool boundaries. Between such transitions, significant intracellular orientation gradients develop along the growth axis of solidification cells. Intracellular orientation gradients are observed alongside both chiral and achiral intercellular rotations, all of which lead to gradual changes in columnar grain orientation along the build direction. These findings provide valuable insight into the formation mechanisms of dislocation cells and residual stresses during LPBF, which will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Other |