| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in High-Temperature Oxidation and Degradation of Materials for Harsh Environments: A SMD and FMD Symposium Honoring Brian Gleeson
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| Presentation Title |
Effects of Alloy and TGO Composition on the Mixed Deposit-Induced Degradation of Advanced Alloys |
| Author(s) |
Atharva Chikhalikar, David Poerschke |
| On-Site Speaker (Planned) |
David Poerschke |
| Abstract Scope |
Mixed deposits containing combinations of oxides and sulfates can accelerate the degradation of alloys at temperatures above typical sodium sulfate-based corrosion. Key insights regarding the effect of alloy components present in the TGO on the corrosion mechanisms are essential for the development of novel alloys/coatings. This work used alloys systematically selected to explore the effect of major TGO components (e.g., Al2O3, NiO, Cr2O3, CoO, etc.) and minor alloying elements on the mechanisms of deposit-induced corrosion in air and air-SO2 atmospheres. Samples were characterized using an image analysis approach to quantitatively compare the degradation intensity as a function of alloy composition and test conditions. Insights from microstructure analysis and thermodynamics models are used identify the predominant corrosion mechanisms. The results enhance the understanding of the key parameters affecting the corrosion mechanisms and provide insights regarding the development of alloys and coatings for next-generation turbine systems. |