The results of "creep" tests at different temperatures are given for three groups of alloys. The 11 metals in the first group included commercial alloys of nickel, chromium, and iron, both with and without tungsten, and low chromium steels containing also tungsten, vanadium, or molybdenum. The second group comprised two carbon steels, a Z X A per cent nickel steel and two low nickel chronmium steels which were tested only at 700°F.; the 12 alloys of the third group were melted in a high-frequency induction furnace, and their compositions were selected to show the general trends at 1,000°F. in the load-carrying ability of castings of the nickel-chromium-iron system.. A metallographic study of the creep-test specimens revealed intercrystalline weakness in some of the wrought nickel-chromium-iron alloys especially at temperatures between 1,160°and 1,390°F. A study was also made of the effect of deformation in the creep tests at different temperatures on the hardness and impact resistance of a chromium vanadium steel at atmospheric temperatures.
Determinations of creep at temperatures between 750°and 1,100°F. were made on two tungsten-chromium-vanadium and a molybdenum-chromiumvanadium steel. These steels were tested as tempered after mechanical working (rolling) and are compared with steels of similar compositions which had been oil quenched and tempered.
The tensile properties as measured in "short-time" tests were determined for a medium-manganese steel at 900°F.; for a series of cast nickel-chromium-iron alloys containing about 0.5 per cent carbon, 35 per cent chromium and from 10 to 45 per cent nickel, at a temperature of 1,550°F.; and for three tungstenchromium-vanadium steels and four molybdenum-chromium-vanadium steels at temperatures of 850°and 1,000°F.
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