| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Computation Assisted Materials Development for Improved Corrosion Resistance
|
| Presentation Title |
Simulation of Dissolution of \Gamma\Prime Precipitates in Ni-base Superalloys during Oxidation |
| Author(s) |
Taiwu Yu, Christopher Taylor, Babu Viswanathan, Brett Tossey, Yunzhi Wang |
| On-Site Speaker (Planned) |
Taiwu Yu |
| Abstract Scope |
Slow-growing oxides like Al2O3 and Cr2O3 form at the surface of Ni-base superalloy heat exchangers during high temperature exposure, which alters the microstructure near the surface due to the depletion of the oxidizing elements. In this presentation we show how to combine density functional theory and DICTRA simulation to calculate concentration variation of the oxidizing elements and dissolution of precipitates of Alloy 282. By DICTRA we predict quantitatively concentration profiles and the volume fraction of precipitates. The changes of average particle size as well as size distribution of the precipitates are conducted through Panprecipitation module in Pandat. Furthermore, a parallel simulation is conducted based on a phase field model to show more details on the change of precipitate microstructure during the dissolution. The simulation results are compared with experimental characterization and they show a good agreement. This work illustrates the usefulness of applying the CALPHAD methods in designing oxidation-resistance alloys. |