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Accession Number:
AD1155227
Title:
Microstructural Instabilities in Single Crystal Metals for Extreme Environments
Report Date:
2021-09-27
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 Type:
Conference:
Journal:
Pages:
28
File Size:
4.92MB
FA9550-17-1-0233
(FA95501710233);
Contracts:
Grants:
Distribution Statement:
Approved For Public Release
