Short term creep rupture predictions for Tantalum alloy T-3
A knowledge of the short term creep rupture behavior of Tantalum alloy T-111 is necessary to predict device integrity in the heat source section of Radioisotope Thermoelectric Generators (RTG's) at the end of service life, in the event of a fuel fire. High pressures exist in RTG's near the end of service life, these are caused by gas generation resulting from radioactive decay of the nuclear fuel. The internal pressure exerts a significant hoop stress on the T-111 alloy structural containment member. This paper analyses the short term creep behavior (rupture times up to {approximately}2 {times} 10{sup 3} hrs.) of cold worked (CW) T-111 alloy, using the existing data of Stephenson (1967). Corellations for the time to rupture, time to 1% strain and minimum creep rate have been obtained from this data using multivariable linear regression analysis. These results are compared to other short term rupture data for T-111 alloy. Finally, at the stress/temperature levels relevant to the RTG fuel fire scenario near the end of service life, the rupture time correlation for T-111 alloy predicts a rupture time of approximately 100 hrs. 10 refs., 3 figs., 1 tab.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6394169
- Report Number(s):
- SAND-90-2778C; CONF-910116-3; ON: DE91002338
- Resource Relation:
- Conference: 8. symposium on space nuclear power systems, Albuquerque, NM (USA), 6-10 Jan 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
HAFNIUM ALLOYS
CREEP
TANTALUM BASE ALLOYS
TUNGSTEN ALLOYS
CONTAINMENT
CORRELATIONS
FIRES
PRESSURE EFFECTS
RUPTURES
STRAINS
THERMOELECTRIC GENERATORS
ALLOYS
DIRECT ENERGY CONVERTERS
FAILURES
MECHANICAL PROPERTIES
TANTALUM ALLOYS
NESDPS Office of Nuclear Energy Space and Defense Power Systems
300303* - Thermoelectric Generators- Materials
Components
& Auxiliaries
360103 - Metals & Alloys- Mechanical Properties