About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
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 |
Aggressive mechanical and environmental conditions in the hot sections of jet engines lead to creep and oxidation enhanced fatigue damage on high-performance metal components. Understanding the 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 drop method. Specimens were tested in lab air and vacuum at elevated temperature at constant ΔK and loaded according to a trapezoidal waveform with dwells ranging from 1 to 300 seconds. Grain-to-grain analyses for each dwell and temperature were performed by assessing the plastic damage and dislocation structure of [100], [110] and [111] grains along the crack wake using high-resolution EBSD and TEM. An approach for decoupling creep, fatigue, and oxidation damage mechanisms, in the context of understanding and modeling high temperature fatigue, was developed using fractography and quantitative comparisons of crack growth kinetics for each test condition. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, High-Temperature Materials, Environmental Effects |