Generation of Long Time Creep Data of Refractory Alloys at Elevated Temperatures
Abstract
Creep tests were conducted on selected refractory alloys in a vacuum environment (< 1 x 10(exp -8) torr) for times between 100 and 15, 000 hours. Since the ultimate program goal was to provide design data for space electric power systems, particular emphasis was placed on measuring creep extension below 1%. The resulting data were evaluated in terms of the relative properties of columbium, molybdenum, tantalum, and tungsten-base alloys. Larson-Miller and Manson-Haferd techniques were used to present the data in parametric form. In the 1800 deg F (982 deg C) to 2200 deg F (1204 deg C) temperature range, the moly bdenum-base alloys TZC and TZM possess the best creep properties for potential turbine applications. The variability of the creep properties as a function of heat of material was determined for the T-III alloy. In addition to comparison of alloy creep properties, chemical analysis, metallography, and tensile test data are presented to characterize each of the materials before and after creep testing.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1968
- Accession Number
- ADA405656
Entities
People
- E. A. Steigerwald
- J. C. Sawyer