High hardness and low friction of Ti-6Al-4V and Inconel 718 Alloy at High Temperatures

Some products made of Ti-6Al-4V and Inconel 718 alloys are being used at certain elevated temperature. Surface modification of Ti-6Al-4V and Inconel 718 alloys at elevated temperature showed improved mechanical properties in terms of hardness and compressive residual stress. In this study, a novel surface modification technology, UNSM (Ultrasonic Nanocrystal surface modification) has been applied to improve mechanical properties and performance at several elevated temperatures up to 700 ⁰C. Ball-on-disc and ball rolling contact fatigue tests are in progress at the elevated temperatures to investigate the mechanical and frictional properties of alloys at high temperatures. Microstructural and mechanical analysis will be added to explain their behavior.