Microstructure and mechanical properties of wire arc additive repairing Ti–5Al–2Sn–2Zr–4Mo–4Cr titanium alloy

Wire arc additive manufacture (WAAM) technology was employed to repair Ti–5Al–2Sn–2Zr–4Mo–4Cr (TC17) titanium alloy, which is widely used as compressor blades and blisk. The microstructure evolution and mechanical properties of the repaired specimen were investigated. The results show that the repaired specimen has a good verticality, and it forms good metallurgical bonding with the base metal. The ultimate strength of the interface specimen can reach 88.2% of the base metal. The elongation is slightly lower than the base metal due to the fact that half of the tensile interface specimens with little deformation are base material. Therefore, WAAM technology might be a potential and economical method to repair damaged blade by optimising the WAAM process.