Electron Beam Welding and Post Heat Treatment of a New Near-Beta High-Strength Ti-4Al-5Mo-5V-5Cr-1Nb Alloy

Ti-4Al-5Mo-5V-5Cr-1Nb (wt.%) is a new type of high-strength (~1300 MPa) titanium (Ti) alloy developed for aerospace applications. Until now, the research on its welding and subsequent heat treatment barren. Herein, we employed electron beam (EBW) to solutionized with phase constituent α + β investigated microstructure mechanical properties in both as-welded (AW) post-weld aging treated (PWAT) conditions. Results showed that due thermal input process, original base material (BM) transformed into fusion zone (FZ). Similar microstructural evolution was observed heat-affected (HAZ) near FZ (Near-HAZ), whereas HAZ far away from (Far-HAZ) contained small amount round (ghost α) slower cooling rate. Such change resulted poor tensile strength (~780 Mpa) joint. After PWAT, large number acicular precipitated size (S) different zones followed order SFar-HAZ < SFZ ≈ SNear-HAZ SBM. The presence αs precipitates remedied weld joint almost same as BM. present findings established foundation application this Ti alloy.