Post Weld Annealing of Welded Joints of Refractory Titanium Alloys VT41 AND VT8-1

Abstract

Mechanical properties and structure of butt welded pseudo-α-(VT41) and (α + β)-(VT8-1) refractory titanium alloys are studied as applied to electron-beam welding of rotor parts of gas turbine engine compressors. Welded joints of VT8-1 + VT8-1, VT8-1 + VT41 and VT41 + VT41 are studied. The effect of post weld annealing on the short-term and long-term strength and impact strength of matrix metal is studied in the operating temperature range. Partial annealing of welded joints is shown to have a favorable effect on matrix metal and weld material strength properties without a substantial reduction in high-temperature strength. Weld metal ductility remains at a low level, while that of the matrix metal hardly decreases.