Study on Preparation,Microstructure and Mechanical Properties of Oversized TC18 Titanium Alloy Bar for Aviation
The TC18 titanium alloy ingot with diameter of 720 mm was prepared by three times vacuum consumable arc melting.The oversized φ500 mm TC18 titanium alloy bar for aviation was successfully prepared by 80 MN rapid forging machine via cogging,multiple pass upsetting and drawing.The uniformity of microstructure and the stability of mechanical properties were evaluated and analyzed.The results show that the range of main elements at different positions of TC18 titanium alloy ingot is less than 0.1%indicating well composition uniformity.The macrostructure of TC18 titanium alloy bar at different positions is uniform and fuzzy,and the microstructure presents a typical bimodal microstructure with good uniformity.The mechanical properties of the bar at different positions show well consistency and performance stability.
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