| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Microstructural Evolution of Additively Manufactured Inconel 718 |
| Author(s) |
Laura K. Farris, E. Lee, Judy Schneider |
| On-Site Speaker (Planned) |
Laura K. Farris |
| Abstract Scope |
Inconel 718 (IN718) is a precipitation strengthened, nickel-based superalloy that is used in the Additive Manufacturing (AM) of low volume, complex parts. Rapid melting, solidification, and reheating during AM process exposes the material to non-equilibrium conditions affecting the phases formed. During solidification, the Niobium (Nb) can segregate into carbide, Laves or δ phases leaving an insufficient amount of Nb necessary for the formation of strengthening phases (g’ and g”). Knowledge of initial phase formation and their critical temperatures is essential to optimize heat treatment cycles that will resolutionize solidification phases and promote strengthening during aging treatments. Various experimental characterization techniques are used in this study to evaluate phases formed in IN718 fabricated by powder bed fusion (PBF) for both as-build and post heat-treated conditions. Critical equilibrium temperatures for secondary phase formation are computationally modeled and compared to experimental results. The current model only focuses on thermodynamic equilibrium and does not include kinetics of change. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |