About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation and Damage Mechanisms of High Temperature Alloys
|
Presentation Title |
Contributions of Oxidation and Creep to High Temperature Fatigue Crack Susceptibility in Waspaloy |
Author(s) |
Alex M. Jennion, Zachary D. Harris, James T. Burns |
On-Site Speaker (Planned) |
Alex M. Jennion |
Abstract Scope |
The aggressive mechanical and environmental conditions in the hot sections of jet engines leads to creep and oxidation enhanced fatigue damage on high-performance metal components. Understanding the relative contribution of oxidation, cyclic damage accumulation, and creep is needed. Crack growth kinetics data were gathered on SENT fracture mechanics specimens using the direct current potential difference method. Specimens were tested in lab air and vacuum at elevated temperature at a constant ΔK and loaded according to a trapezoidal waveform with dwells ranging from 1 to 300 seconds. Plastic deformation and dislocation cell structure along the crack wake was assessed using high resolution electron backscatter diffraction and TEM. Quantitative comparisons of crack growth kinetics and deformation character for each test condition are performed and provide insight into the contribution of creep and oxidation to crack growth in the context of understanding and modeling high temperature fatigue behavior. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Environmental Effects, |