Influence of Ultrasonic Deep Rolling on Reducing Surface Roughness and Healing Surface Scar of TC4 Titanium Alloy

Abstract:

In order to evaluate the effects of ultrasonic deep rolling process on the reducing surface roughness and healing surface scar or micro-damage, some line type surface notches and pit like surface caves were prepared and followed by ultrasonic deep rolling treatment on Ti-6Al-4V plate to simulate the foreign object damage. The surface roughness and geometry were evaluated by a surface profile tester and SEM observation for both the treated and untreated specimens. Results show that the surface roughness of the specimen can be reduced from Ra 2.32 μm to 0.11 μm by the ultrasonic deep rolling process. Some line type surface notches and pit like surface caves were significantly attenuated. The above results are expected to improve the anti-fatigue performance of parts effectively or to restore the fatigue resistance of the FOD damaged surface