INVESTIGATION ON THE STRESS-RUPTURE STRENGTH OF COLD STRESSED TUNGSTEN AND ITS ALLOY WITH MOLYBDENUM AT TEMPERATURES ABOVE 1400 C.
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The tests for stress-rupture strength were made by rapid heating of already loaded specimens and marking the time up to failure. The lengthening of the specimen connected with the creep was measured every minute. The rate of the heating was about 1000 C per second. The time up to failure varied in accordance with the selection of loads and amounted to from 1 to 100 minutes. A comparison of the stress-rupture strength of tungsten with that of the alloy VM50 shows that the alloy for 10-minute strength on 4 - 1 kg-wtsq mm yields to tungsten. At the same time, the alloy possesses long-lasting plasticity, longer than that of pure tungsten. The failure of the alloy VM50 occurred ordinarily with the formation of a neck, and sometimes with several necks. Good combination of strength and plasticity assures the possibility of the use of the alloy VM50 as high-temperature building material.
- Metallurgy and Metallography