About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials for High Temperature Applications: Next Generation Superalloys and Beyond
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Presentation Title |
Concomitant Oxidation-diffusion-creep Processes for Stress Generation and Its Effects in Cyclic Oxidation Behavior |
Author(s) |
Yanfei Gao |
On-Site Speaker (Planned) |
Yanfei Gao |
Abstract Scope |
Metallic materials under extreme environmental service conditions oftentimes fail from the morphological instability of such layers at the oxide-alloy interface, such as the rumpling of oxide layer and the formation of oxide pegs under thermal cycles. This work suggests that a tensile, biaxial stress arises in the base alloy due to the concomitant oxidation-diffusion-creep processes, which is different from various mechanisms in literature for the growth stress in the oxide layer. Such a stress in the substrate could provide a stabilizing factor that suppresses the rumpling or compositional variation in the oxide layer. But it may also accelerate the formation of oxide pegs under cyclic oxidation conditions. Predictions will be compared to a number of recent experiments for turbine engines and fossil-fuel power plants. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Environmental Effects, Modeling and Simulation |