Accession Number : AD0635635

Title :   DEVELOPMENT OF A STABLE-BETA TITANIUM ALLOY.

Descriptive Note : Quarterly rept. no. 14, 1 Oct-31 Dec 65.

Corporate Author : TITANIUM METALS CORP OF AMERICA NEW YORK

Personal Author(s) : Hunter, D. B.

Report Date : 31 DEC 1965

Pagination or Media Count : 44

Abstract : The evaluation of Ti-8Mo-*v-2Fe-3Al was completed. The notch (K sub t=3.5) fatigue limit of this alloy when aged to a strength level of 180 Ksi was shown to lie in the range of 30-35 Kpsi for 10 million cycles, and its plane strain crack propagation resistance, K sub ic, was 45-60 Kpsi square root of (in). Hot salt stress corrosion tests showed that the maximum stress tolerated for 200 hours at 600F without cracking occurring was 50 Kpsi, and at 800F, 25 Kpsi. Full range creep curves, using 500 hour exposure times, were obtained. Room temperature bend tests showed that stabilized material could be bent to a tighter radius than aged material, but that at 1100-1400F, all samples could pass a 3T bend. Weldability studies indicated that when welded, all samples were ductile with yield strengths around 120 Kpsi, but that aging after welding produced high strengths. As-welded bend values of 3T or less were found. When welded samples were exposed for 500 hours at 650F in the aged stabilized conditions, some ductility was retained. (Author)

Descriptors :   (*TITANIUM ALLOYS, AGING(MATERIALS)), FATIGUE(MECHANICS), NOTCH TOUGHNESS, STRESS CORROSION, DISPERSION HARDENING, CREEP, DEFORMATION, WELDS, DUCTILITY, TENSILE PROPERTIES, ALUMINUM ALLOYS, IRON ALLOYS, VANADIUM ALLOYS, MOLYBDENUM ALLOYS

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE