| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys III
|
| Presentation Title |
Low Cycle Fatigue of Single Crystal γ'-Strengthened Co-based Superalloys at 750 °C in Air |
| Author(s) |
Sean P. Murray, Jean-Charles Stinville, Robert K. Rhein, Patrick G. Callahan, Tresa M. Pollock |
| On-Site Speaker (Planned) |
Sean P. Murray |
| Abstract Scope |
Novel materials that could be introduced into the hot sections of turbine engines, such as γ'-strengthened Co-based superalloys, must be able to maintain their mechanical integrity at high temperatures and stresses in an oxidative environment. In addition to creep damage during operation, single crystal blades and vanes in turbine engines also experience cyclic loading that can lead to catastrophic fatigue failure. Understanding the mechanisms that control these failures could motivate new alloying and processing strategies in order to mitigate fatigue failures in this alloy system. The low cycle fatigue behavior of single crystal γ'-strengthened Co-based superalloys is investigated under load-controlled, R = 0.0 cyclic loading at 750 °C in air. Optical microscopy, scanning electron microscopy, and transmission electron microscopy are utilized to study the effect of maximum cyclic stress on fracture surface morphology, oxide-assisted crack growth, and deformation mechanisms within the γ/γ' microstructure. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |