Abstract
This article investigated the effect of different ultrasonic surface rolling (USR) processing parameters on microstructure, surface layer properties, and fretting wear properties of a kind of high strength and high toughness titanium alloy Ti5Al4Mo6V2Nb1Fe. With the aid of SEM, TEM, EDS, and 3D-profile scanning, the surface layer of specimens was characterized and analyzed. The experimental results showed that the severe plastic deformation took place on the specimen surface layer. The thickness of plastic deformation layer could reach more than 230 μm. The grains in the surface layer were refined, which was induced by dislocations of high density, such as dislocation tangles and dislocation walls. The surface layer properties were improved compared with untreated specimen: the surface roughness decreased from 0.18 μm of untreated specimen to 0.06 μm; the microhardness of surface increased about 20%; the compressive residual stress about −1000 MPa occurred. The wear rate reduced about 70% after USR and the fretting wear resistance was improved.
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