About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fundamental Science of Microstructural Evolution and Phase Transformations: An MPMD/FMD/SMD Symposium in Honor of Peter Voorhees
|
| Presentation Title |
Phase-field and Mean-field modeling of phase transformations in additively manufactured IN738LC Ni-based superalloy |
| Author(s) |
Kyoungdoc Kim, Shailendra Kumar Verma, Magnus Anderson, Soung Yeoul Ahn, Hyoung Seop Kim |
| On-Site Speaker (Planned) |
|
| Abstract Scope |
We investigate the microstructure evolutions of the IN738LC during additive manufacturing process using phase-field and mean-field modeling techniques. We find that the dendrite impingement is observed at low thermal gradient during solidification, and it decreases the solute segregation at cell boundaries. Thus, MC carbide formation decreases under high laser-power and high scan-speed conditions, which is the optimized combination that minimizes defects such as pores, lack of fusion, micro-cracks. The γ' coarsening kinetics is also investigated to understand the transition physics of bimodal and unimodal distributions. We find that the γ' volume fraction is an important parameter in the mean-field modeling, which is slightly higher than the equilibrium value due to non-equilibrium composition of γ-γ' phases in the additively manufactured superalloy. It is also found that the γ/γ' interfacial energy and z factor have more influence on the γ' precipitate coarsening kinetics than the mobility parameter in additively manufactured IN738LC. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Additive Manufacturing |