Stress-Rupture Properties of Tungsten Wire from 1200 degree to 2500 degree F
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER
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The stress-rupture properties of 5-mil-diameter, type 218CS tungsten wire were determined for rupture times up to about 200 hours at test temperatures from 12000 to 25000 F. Results showed that the rupture properties were superior to those reported for other forms of tungsten, other refractory metals, and super alloys in this temperature range. The onset of primary recrystallization observed between 18000 and 20000 F was indicated by a decrease in microhardness, a decrease in ductility, and a coarsening of grain size. The strength superiority of the wire over the other materials was maintained beyond the onset of primary recrystallization.
- Laminates and Composite Materials
- Metallurgy and Metallography