VANADIUM ALLOY STUDIES.
Bimonthly rept. no. 5, 1 Oct-30 Nov 64,
IIT RESEARCH INST CHICAGO ILL
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This program is concerned with the development of vanadium alloys having improved short-time creep properties at temperatures up to 2400F. The alloy V-40Cb-30Ta-1Ti and this base complexed with various combinations of boron, carbon, hafnium, and silicon were readily cold rolled after thermal homogenization of the arc-melted ingots in some cases a 2400F press forging operation was required for initial ingot breakdown. Most of the compositions exhibited twinning when deformed at room temperature, and unusually high room-temperature strength and ductility were obtained--the alloy containing 0.23 wt Si and 0.075 wt C had a density-corrected ultimate strength of 650,000 psilbin3, with 24 elongation. Addition of 1.5 wt Hf and 0.075 wt C produced a substantial increase in the 2200F creep resistance of the V-40Cb-30Ta-1Ti base. Author