| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Designing Complex Microstructures through Additive Manufacturing
|
| Presentation Title |
A Corroborative In-Situ, Ex-Situ and 3D Study of Recrystallisation in ABD-900AM |
| Author(s) |
Yuanbo Tang, Anh Hoang Pham |
| On-Site Speaker (Planned) |
Yuanbo Tang |
| Abstract Scope |
We made particular use of high-temperature confocal laser scanning microscopy to investigate static recrystallization in as-printed ABD-900AM superalloy. In this way, insights are gained into important recrystallisation process with direct observations made – for the first time in this class of material – of phenomena such as nucleation of recrystallisation, subsequent grain growth, jerky flow of boundaries due to pinning and twin formation. The nucleation process – requiring strain-free lattice to be created by grain boundary migration – is visualised and its role in limiting the kinetics of recrystallisation is elucidated. Moreover, it is demonstrated that boundary mobility is initially prevented by Smith-Zener pinning due to fine dispersion of secondary phases but also with a role played by solute drag caused by cellular micro-segregation. With increasing annealing time, the retarding pressure reduces due to carbide coarsening and/or dissolution as well as matrix compositional homogenisation, eventually allowing recrystallisation to take place. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, |