Effects of induction preheating on microstructure and residual stress of laser deposition repair TA15 titanium alloy

Both 6 kW fiber laser deposition repair system and electromagnetic induction heating equipment were utilized, laser deposition repair experiments were respectively done by TA15 titanium powder under substrate without preheating and preheating at 200℃ and 400℃. Then microstructure, microhardness and residual stress were tested and analyzed through optical microscope, microhardness tester and indentation stress tester, the influence of microstructure, microhardness and residual stress in different substrate preheating temperature on the laser deposition repair sample was achieved. Results show that microstructure of lamella becomes thicker and primary grow more fully; microhardness of material is slightly reduced; residual stress is effectively reduced with the increasing of preheating temperature. The guidance basis for laser deposition repair assisted by induction heating is provided.