About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Multiscale and Non-Equilibrium Solidification Fundamentals
|
| Presentation Title |
CALPHAD-based modelling of solidification and precipitation in LPBF 17-4PH stainless steel |
| Author(s) |
Yanheng Xie, Dylan Cuskelly, Églantine Herbaux, Matteo Seita |
| On-Site Speaker (Planned) |
Yanheng Xie |
| Abstract Scope |
Thermal history during laser powder bed fusion (LPBF) governs the microstructural evolution of 17-4 PH stainless steel, including the formation of Cu-rich precipitates form within a martensitic matrix. Gaining precise control over it, however, is challenging and may require several experimental iterations.
We have developed a computational framework to predict the thermal history and the corresponding phase transformations that occur during LPBF of 17-4PH. Our framework integrates Scheil solidification and Mean-field precipitation kinetics models within CALPHAD, enabling the simulation of solidifying phases and solid-state phase transformations under non-equilibrium conditions that are representative of LPBF.
This modelling strategy directly links laser parameters to microstructural evolution, providing an opportunity to design and tailor the alloy microstructure in-situ during LPBF. This capability enables precipitation hardening while avoiding the post-processing heat treatments that prolong production time and increase part cost, thereby improving the overall manufacturing efficiency. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Modeling and Simulation, Phase Transformations |