| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing Modeling and Simulation: AM Materials, Processes, and Mechanics
|
| Presentation Title |
Phase Field Simulations of Solid-state Precipitation in AM-processed 625 and 718 Alloys during Post-process Annealing |
| Author(s) |
Bala Radhakrishnan, Younggil Song, Sarma Gorti, Steve DeWitt, John Turner, Lyle Levine, Ranadip Acharya, William Tredway, Amrita Basak, Tanjheel Mahdi |
| On-Site Speaker (Planned) |
Bala Radhakrishnan |
| Abstract Scope |
We present large scale, phase field simulations of microstructure evolution during post-processing of 718 and 625 alloys produced by laser powder bed fusion additive manufacturing. The simulations capture the effect of micro segregation of alloying elements on the growth kinetics and morphology of co-precipitating phases - gamma', gamma" and delta as a function of annealing schedule. The simulations will also capture the effect of partial dissolution of the Laves phase in the as-solidified microstructure on the precipitation structure during subsequent aging. The objective of the simulations is to optimize the post-process heat treatment in these alloys to meet target properties. The simulation results are validated using results of advanced characterization performed on the AM-processed materials. Research supported by the Department of Energy's HPC4EI program and the Exascale Computing project at the Oak Ridge National Laboratory. The simulations were performed using the Oak Ridge Leadership Class computing facilities. |