Microstructural Instabilities in Single Crystal Metals for Extreme Environments
Abstract
As the US Air Force fleet continues to age, a greater portion of its budget will be required to ensure safe and effective operations beyond the design service life. In fact, for various military vehicles and platforms, the recommended service life for safe operation is projected to increase by a factor of 1.5 to 5 (AFRL, 2014). The high demand for safety and cost reduction culminates in the case of materials systems operating under extreme environments such as turbine blades made of Ni-based single crystal superalloys. Turbine blades are used in the hot section of the engine and are, therefore, subjected to multiaxial high-temperature viscoplastic deformations, namely, creep and dwell/fatigue, due to both their complex geometry and their advanced design, e.g., internal cooling channels aimed to increase the exhaust-gas temperature during in-service operations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 27, 2021
- Accession Number
- AD1230434
Entities
People
- Jean-briac Le Graverend
Organizations
- Texas Engineering Experiment Station