IMPROVED VANADIUM-BASE ALLOYS
Abstract
Alloys based on V-5w/oTi-20w/oCb and V-60w/oCb 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 60w/o columbuim level measured under He were above 60,000 psi at 2000 deg F and up to 44,400 psi at 2200 deg F; the strongest alloy at 2200 F was V-1w/oHf-60w/oCb. Materials at the 20wt-% Nb level were at least 30% lower in strength at all temperatures. Stress-rupture properties at 2000 deg F of compositions based on V-5wt-%Ti-20wt-%Nb and V-60wt-% Nb were substantially improved by addition of 0.05wt-% C. 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 He due to 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 F did not impair the mechanical properties of V-5wt-%Ti20wt-%Nb, although slight pitting was observed at 1000 deg F.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 20, 1961
- Accession Number
- AD0272184
Entities
People
- B. R. Rajala
- F. C. Holtz
Organizations
- IIT Research Institute