| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Stimulating the Evolution of γ’/γ” Precipitates in the Inter-dendritic Regions of Additively Manufactured IN718 Due to Post-processing Heat Treatments |
| Author(s) |
Younggil Song, Bala Radhakrishnan, Ranadip Acharya |
| On-Site Speaker (Planned) |
Younggil Song |
| Abstract Scope |
We present simulations of microstructure evolution during post-process annealing of Inconel alloy 718 (IN718) made by powder bed laser additive manufacturing. Additively manufactured IN718 forms finer dendrites, steeper Nb gradients, and finer Laves phase distributions compared to traditional cast materials, and thus requires custom post-processing heat treatments. The heat treatment leads to dissolution of Laves phase within inter-dendritic regions, followed by the formation of γ’, γ”, and δ precipitates in the Nb-rich areas, and further evolution to equilibrium volume fractions of these phases. We perform multi-phase-field simulations using a quaternary surrogate alloy to investigate the above phase evolution, which are compared to post-process-annealed microstructures of AM IN718. The simulation results are used to design efficient heat procedures for AM IN718 to achieve target mechanical properties.
Research performed at ORNL under contract DE-AC05-00OR22725 and the Advanced Manufacturing Office through the High Performance Computing for Manufacturing Program at the Department of Energy. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |