About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advanced Materials for Harsh Environments
|
| Presentation Title |
Influence of Water Vapor on Hot Corrosion of Nickel-Based Superalloys |
| Author(s) |
Till Koenig, Ceyhun Oskay, Mathias C. Galetz |
| On-Site Speaker (Planned) |
Mathias C. Galetz |
| Abstract Scope |
Water vapor is well known to result in higher volatilization rates of the protective oxide scales and that it can accelerate the oxidation kinetics. Additionally, materials do not only suffer from oxidation, but also from more complex forms of degradation. Hot corrosion is induced by molten salt deposits from air intake or sulfur-rich fuel impurities. It results in an accelerated material degradation between around 700°C (type II) to 900°C (type I). The present work investigated the influence of different levels of water vapor (0, 4 and 40 vol%) on hot corrosion type I. The tests were performed with a sprayed salt deposit of Na<sub>2</sub>SO<sub>4</sub> and K<sub>2</sub>SO<sub>4</sub> (80:20) in synthetic air with 300 ppm SO<sub>2</sub> at 900°C. The corrosion kinetics of several nickel-based superalloys with varying chromium and aluminum contents, CMSX-4, René 80 and IN 939 were described using cumulative probability plots after different exposure times (200, 600 and 1000 h). |