Titanium alloy bar suitable for highly efficient wear-resistance treatment

To give the wear-resistance to titanium intake valve by simple oxidation treatment, the oxidation condition and the microstructure of Ti-6Al-4V bar were studied. The wear test using a valve simulator shows that the wear of the face oxidized at 820 °C for 1 and 4h in air is superior to that of ferrous valve. The best microstructure of Ti-6Al-4V bar is an acicular structure with the prior β grain size of 30 to 60 μm in average, which prevents distortion during the oxidation treatment and has excellent mechanical properties.