IMPROVED VANADIUM-BASE ALLOYS. Final Report for period December 1, 1960 to November 30, 1961
Alloys based on V-5 wt% Ti-20 wt% Nb and V-60 wt% Nb were found to exhibit excellent fabricability and weldability with good retention of strength to at least 2200 deg F. Ultimate tensile strength values of materials at the 60 wt% niobium level measured under helium were above 60,000 psi at 2000 deg F and up to 44,400 psi at 2200 deg F; the strongest alloy at 2200 deg F was V-1 wt % Hf -60 wt% Nb. Materials at the 20 wt % niobium level were at least 30% lower in strength at all temperatures. Stress-rupture properties at 2000 deg F of compositions based on V-5 wt% Ti-20 wt% Nb and V-60 wt% Nb were substantially improved by addition of 0.05 wt% carbon. Interstitial impurities in the raw materials and those picked up during melting and hot working were found to reduce workability and to increase elevated-temperature strength. Tensile data obtained at elevated temperatures under vacuum were lower than those measured under helium Erom reduced pickup of interstitials during testing. Alloys based on V- Ti -(Nb) -Si exhibited interesting age-hardening characteristics at 1200 deg F. Exposure to a saline environment under stress at 800 and 1000 deg F did not impair the mechanical properties of V 5 wt% Ti-20 wt% Nb, although slight pitting was observed at 1000 deg F. (auth)
- Research Organization:
- Illinois Inst. of Tech., Chicago. Armour Research Foundation
- NSA Number:
- NSA-16-005680
- OSTI ID:
- 4821407
- Report Number(s):
- ARF-2210-6
- Country of Publication:
- United States
- Language:
- English
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