| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Solid-State Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Simulation of Solid State Precipitation during Post Process Annealing of Additively Manufactured alloy 625 |
| Author(s) |
Bala Radhakrishnan, Younggil Song, John Turner |
| On-Site Speaker (Planned) |
Bala Radhakrishnan |
| Abstract Scope |
During laser powder bed fusion processing of alloy 625, solutes such as Mo and Nb segregate to the inter-dendritic regions of the solidification microstructure. The delta phase is known to precipitate in these solute-rich regions during post-process annealing at 870K. We present phase field simulations of post-process anneal using an in-house developed phase field code at ORNL. The phase field code is linked to alloy thermodynamics through Calphad based free energies of the matrix and precipitate phases in the alloy. The simulations indicate that in the absence of dislocations in the matrix, the gamma” phase forms during the 870K anneal. However, when the increase in the matrix energy due to the observed dislocation density in the AM material is included, the delta phase forms at the expense of the gamma” phase in accordance with experimental results. Research sponsored by the Exascale Computing Program at ORNL under contract DE-AC05-00OR22725. |
| Proceedings Inclusion? |
Planned: |