| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
Formation and Composition of Hot Corrosion Deposits on Model Ni-Cr-Al Alloys |
| Author(s) |
Kevin J. Meisner, Elizabeth J. Opila |
| On-Site Speaker (Planned) |
Kevin J. Meisner |
| Abstract Scope |
Hot corrosion of superalloys in gas turbines is caused by salt deposits, but the deposit compositions, structure, and mechanisms of formation are poorly understood. Salt deposits were collected on model Ni-Cr-Al, Al2O3, and Pt substrates at 700 °C in a Low Velocity Burner Rig (LVBR). The LVBR combusted marine diesel (0.5 wt% S) and 10 ppmw sea salt was injected into the combustion gases. Deposition kinetics were measured for 14-day exposures by mass changes and Inductively-Coupled Plasma Optical Emission Spectroscopy (ICP-OES) of deposit species. The phases in the deposit mixture were determined by hot stage X-ray Diffraction (XRD). These results were compared to FactSage thermochemical equilibrium predictions. A Chemically Frozen Boundary Layer (CFBL) theory was used to model deposition kinetics and the results were compared to the burner rig data. Implications of the composition, structure, and kinetics of deposit formation on hot corrosion mechanisms are discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |