Accession Number : AD0481554

Title :   PRECRACKED CHARPY IMPACT FRACTURE TOUGHNESS PROPERTIES OF BACKUP FLUX-WELDED TI-5AL-2.5 SN ALLOY PLATE FROM -320 F TO 550 F.

Descriptive Note : Final rept. Feb-Jun 64,

Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Davis, Sidney O. ; Niemi, Roger M.

Report Date : JAN 1966

Pagination or Media Count : 17

Abstract : A program was conducted to evaluate the effects of a proprietary backup fluxwelding technique on the impact fracture toughness properties of Ti-5Al-2.5 Sn alloy plate. Precracked Charpy (often called subsize Charpy) specimens were tested under impact loads at -320, -100, room temperature, and 550 F. The weld and heat affected zone (HAZ) had greater fracture toughness resistance than the base metal. The fracture resistance work per unit area (W/A) decreased with decreasing test temperature. At -320 F the weld and HAZ retained 1/3 of their fracture resistance at room temperature. However, the weld- and HAZ-converted W/A impact fracture resistance at -320 F had a K sub c about 125 ksi square root inch which indicated good toughness for this temperature. The fracture resistance did not appear to be a function of the specimen's location through the thickness of the plate for a given specimen orientation. In general, the fracture resistance of the weld and HAZ compared to the base metal was excellent.

Descriptors :   *TITANIUM ALLOYS, *WELDS, *FRACTURE(MECHANICS), WELDING FLUXES, TOUGHNESS, ALUMINUM ALLOYS, TIN ALLOYS, METAL PLATES, INERT GAS WELDING, BIBLIOGRAPHIES, IMPACT TESTS.

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy

Distribution Statement : APPROVED FOR PUBLIC RELEASE