About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Advanced Materials for Harsh Environments
|
Presentation Title |
High Temperature Mixed Deposit and Oxidation Degradation of a Coated and Uncoated Ni-based Superalloys |
Author(s) |
Matthew Kovalchuk, Brian Gleeson |
On-Site Speaker (Planned) |
Matthew Kovalchuk |
Abstract Scope |
Gas-turbine engine degradation in the high-pressure section is traditionally associated with Na2SO4 deposit and, more recently, CaSO4 deposit. In practice, mixtures of sulfates and oxides comprise particulate matter commonly deposited on engine components. This presentation will systematically assess the degradation behavior of deposit mixtures on a Generation II Ni-based superalloy with and without a chromide coating. Prior work has shown alloy oxidation following deposit-induced degradation can lead to severe internal oxidation attack. Protective scale breakdown and subsurface changes due to mixed deposit degradation are analyzed in terms of subsequent oxidation behavior. Engine and environmental field variables such as water vapor and deposit loading are also discussed. |