| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
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| Symposium
|
Progress towards Understanding the Synthesis and Behavior of Metals Far from Equilibrium: A SMD Symposium Honoring Enrique Lavernia on the Occasion of His 60th Birthday
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| Presentation Title |
Hot Corrosion Degradation of Gas Turbine Materials Subject to Mixed-mode Thermal Exposures and Emerging Complex Corrosion Environments |
| Author(s) |
Kliah Soto Leytan, Kunthea Deng , Maryam Zahiri Azar, Daniel R. Mumm |
| On-Site Speaker (Planned) |
Daniel R. Mumm |
| Abstract Scope |
Turbine engines are pervasive in marine environments, used as aircraft and ship propulsion systems and power generation units. The performance of hot-section materials is dependent upon the exposure temperatures and the corrosive conditions associated with the salt-laden environment. Emerging turbine service needs result in increasingly aggressive/variable duty cycles and more complex deposit chemistries. While basic mechanisms governing sulfate-induced accelerated degradation are fairly well established, an understanding of the effects of microstructural heterogeneities, ingestion of atmospheric particulate matter, and widely varying thermal exposures is lacking. Recent findings show that alkaline earth oxides and silicates ingested as atmospheric contaminants play an exacerbating role in the attack rate for alloys and coatings. Herein, we explore the synergistic effects of mixed-mode thermal cycles and complex deposit chemistries containing sulfates, silicates and/or oxides. Correlations are drawn between the observed degradation mechanisms and the simulated service exposures utilizing controlled-environment testing coupled with high-resolution materials characterization approaches. |
| Proceedings Inclusion? |
Undecided |