| 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 |
Stress Assisted Corrosion of Single Crystal Alloys; In the Type II Sulphidation Regime |
| Author(s) |
Grant Gibson, Jonathan Leggett |
| On-Site Speaker (Planned) |
Grant Gibson |
| Abstract Scope |
The operation of aero gas turbines is becoming increasingly arduous and more variable; as a result of changing aviation trends, combined with a longer time on wing requirement. Historically single crystal alloy development has focused on improving creep resistance; since this has been a traditional mode of component life limitation. As a result, alloy compositions have seen a general reduction in chromium content, leaving them susceptible to sulphidation. Traditionally sulphidation has been described as two distinct modes; Type I and Type II with some literature evidence of a mixed Type III attack at intermediary temperatures (between 750 and 850°C). Most historical testing has negated the role of dynamic or static applied stress on the mechanisms of attack. This presentation will describe the rationale for adopting a more representative test methodology and compare Type II corrosion pitting with the changes in mechanism and morphology associated with mechanical applied stress at 700°C. |