| 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 |
Experimental Considerations Required for the Lab-Scale Replication of Corrosion Experienced by Nickel Superalloy Components in Aviation Gas-Turbine Engines |
| Author(s) |
Patrick Brennan |
| On-Site Speaker (Planned) |
Patrick Brennan |
| Abstract Scope |
This presentation highlights the importance of understanding the service environment that materials are being developed for and how incorporating those characteristics in lab-scale experiments yields a deeper understanding of degradation mechanisms materials experience during service. The research presented covers efforts to diagnose and reproduce corrosion that was experienced by Rene N5 and Rene N500 stage 1 high pressure turbine shrouds. Characterization of field-exposed components revealed that CaSO4 was the primary deposit remaining on the components. Subsequent experimentation revealed that better simulating the service environment at the lab-scale testing by selecting thermal profiles and adding water vapor to the atmosphere are required to reproduce the CaSO4-induced degradation that was observed in field-exposed components. The corrosion mechanism of the field-exposed components is proposed to be breakaway internal oxidation-sulfidation at T < 1000°C of alloys that were depleted of Al and Cr by CaSO4-induced corrosion at 1150°C. |