Accession Number : AD0775599

Title :   The Effect of Filler Metal Chemistry and Heat Treatment on the Weldability of the Ti-6Al-2.5Mo Alloy.

Descriptive Note : Research and development rept.,

Corporate Author : NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD

Personal Author(s) : Cavallaro,Joseph L.

Report Date : FEB 1974

Pagination or Media Count : 70

Abstract : Determination was made of the effects of combined variations in weld-metal chemistry and postweld heat treatment on the mechanical properties and sea-water stress-corrosion-cracking properties of Ti-6Al-2.5Mo weldments. The composition range studied included 4% to 7% aluminum and 0.5% to 2.5% molybdenum. Good fracture toughness and stress-corrosion-cracking resistance for weld metal in the Ti-Al-Mo-O alloy system are achieved at the 110,000 pounds per square inch yield strength level. No degradation of properties was produced in the heat-affected zone of Ti-6Al-2.5Mo weldments. The results of this investigation indicate that a tougher and more ductile Ti-100 alloy weldment could be developed through control of microstructure in the Ti-Al-Mo-O and Ti-Al-V-O alloy systems. (Modified author abstract)

Descriptors :   *Titanium alloys, *Weldability, *Stress corrosion, *Welds, Sea water, Yield strength, Toughness, Crack propagation, Fatigue(Mechanics), Oxygen, Submarine hulls

Subject Categories : Properties of Metals and Alloys
      Submarine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE