Elastic constants of single crystal Hastelloy X at elevated temperatures
- Univ. of Hartford, CT (United States). Dept. of Mechanical and Audio Engineering Technology
- Univ. of Connecticut, Storrs, CT (United States)
- United Technologies Research Center, East Hartford, CT (United States)
An acoustic time of flight technique is described in detail for measuring the elastic constants of cubic single crystals that allows for the constants to be determined at elevated temperature. Although the overall technique is not new, various aspects of the present work may prove extremely useful to others interested in finding these values, especially for aerospace materials applications. Elastic constants were determined for the nickel based alloy, Hastelloy X from room temperature to 1,000 C. Accurate elastic constants were needed as part of an effort to predict both polycrystal mechanical properties and the nature of grain induced heterogeneous mechanical response. The increased accuracy of the acoustically determined constants resulted in up to a 15% change in the predicted stresses in individual grains. These results indicate that the use of elastic single crystal constants of pure nickel as an approximation for the constants of gas turbine single crystal alloys, which is often done today, is inaccurate.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 634736
- Journal Information:
- Journal of Engineering Materials and Technology, Vol. 120, Issue 3; Other Information: PBD: Jul 1998
- Country of Publication:
- United States
- Language:
- English
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