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

摘要

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 110,000pounds 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-100alloy weldment could be developed through control of microstructure in the Ti-Al-Mo-O and Ti-Al-V-O alloy systems. (Modified author abstract)