Microstructure and mechanical properties of Ti-22Al-25Nb/TA15 dissimilar joint fabricated by dual-beam laser welding

Influence of welding process on the properties of dissimilar titanium alloy weldments: a review

“…For instance, in EBW of Ti-22Al-25Nb/TC11 joint, a lower microhardness of the HAZ and a reduction in impact toughness were observed due to the formation of soft B2 phase [47]. Similar behavior was observed in laser welding of Ti-22Al-25Nb/TA15 [32], TIG-laser hybrid welding of Ti-22Al-25Nb/TA15 [42], CO 2 laser welding of Ti-6Al-4V/Ti-4.5A1-3V-2Fe-2Mo, laser welding of BTi-6431S/TA15 [32], laser welding of Ti-6-4/beta-C [51], laser welding of Ti-15V-3Cr-3Al-3Sn/Ti-6Al-4V [41] and electron beam welding of Ti55/TA15.…”

“…Another potential application is compressors with high dynamic loads in which parts such as blades and disks need to be connected and are exposed to variable temperatures. In this case, blades exposed to high temperatures and low working stress require a titanium alloy with a good creep resistance and fracture toughness such as Ti-22Al-25Nb [32]. Similarly, the disk material should have a good ductility and low-cycle fatigue properties due to high working stress (e.g., TA15 alloy) [33].…”

Influence of Filler on the Microstructure, Mechanical Properties and Residual Stresses in TIG Weldments of Dissimilar Titanium Alloys

“…A number of studies have been conducted to investigate the weldments of dissimilar titanium alloys such as cpTi/Ti-6Al-4V [20], Ti-6Al-4V/Ti17 [21], TC17/TC60 [22], Ti-22Al-25Nb/TA15 [23], Ti-22Al-27Nb/TA15 [24], Ti-6Al-4V/Ti-4.5A1-3V-2Fe-2Mo [25], Ti-22Al-25Nb/TC11 [26], Ti-6Al-4V/Ti17,Ti-6Al-4V/BT9 [27] and Ti3Al/Ti-6Al-4V [28] using various techniques e.g., LBW, EBW and TIG-Laser hybrid welding. For instance, Wang et al [27] studied electron beam weldments of Ti-6Al-4V/Ti17 and Ti-6Al-4V/BT9 dissimilar alloys and reported an increased joint strength relative to the base alloys.…”

“…In addition to the observation of Tan et al, a number of other researchers reported weld zone softening in dissimilar titanium alloys weldments resulting in degradation of mechanical properties. For instance, Li et al [23] carried out dual laser welding of dissimilar titanium alloys, namely Ti-22Al-25Nb and TA15. They observed B2 and O phases in the fusion zone resulting in a significant reduction of its microhardness.…”

Microstructure Control of Welded Joints of Dissimilar Titanium Alloys by Isothermal Forging

“…Therefore, it is necessary to explore the manufacturing technology of dual-titanium-alloy components. In recent years, lots of researchers have focused on dual-titanium-alloy welding, such as TC11/TC17 [ 4 ], TC4/TA7 [ 5 ], Ti22Al25Nb/TC4 [ 6 ], and so on [ 7 , 8 , 9 , 10 , 11 ]. However, due to the differences in physical properties and chemical composition between titanium alloys, the microstructure and properties of dual-titanium-alloy welded joints were always poor.…”