Abstract
The effect of the ultrasonic surface rolling process (USRP) on the rotary bending fretting fatigue (FF) of Ti-6Al-4V alloy was investigated. The reason for the USRP’s ability to improve the FF resistance of Ti-6Al-4V alloy was studied. The results revealed that the USRP induced a compressive residual stress field with a depth of 530 μm and a maximum residual stress of −930 MPa. Moreover, the surface micro-hardness of the USRP sample was significantly higher than that of the untreated base material (BM) sample, and the USRP yielded a 72.7% increase in the FF limit of the alloy. These further enhanced fatigue properties contributed mainly to the compressive residual stress field with large numerical value and deep distribution, which could effectively suppress FF crack initiation and early propagation. The USRP-induced surface work-hardening had only a minor impact on the FF resistance.
Highlights
Titanium alloys have been widely used in the manufacture of aero-engine compressor blades and disks owing to their low density, high specific strength, excellent corrosion resistance, and ability to operate at elevated temperatures
Recent studies have reported that laser peening [7], low plasticity burnishing (LPB) [8], and deep rolling (DR) [9] can significantly improve the fretting fatigue (FF) resistance of metallic materials
ultrasonic surface rolling process (USRP) experiments wereset-up performed on a self-built platform based on a rolling conventional lathe.ball was firmly attached to the ultrasonic apparatus, and allowed to roll and strike the surface of samples firmly attached to thediagram ultrasonic in allowed and strike surface of samples
Summary
Titanium alloys have been widely used in the manufacture of aero-engine compressor blades and disks owing to their low density, high specific strength, excellent corrosion resistance, and ability to operate at elevated temperatures. Surface engineering techniques for improving the FF performance of titanium alloys have gained considerable attention [2,3,4] Among these surface treatment methods, conventional shot peening (SP). The mechanical energy is amplified and aggregated by the ultrasonic horn, resulting in a high-power ultrasonic wave, which drives the impact tool ball that strikes and rolls along the metal surface at high velocities These repeated and high-frequency strikes lead to severe plastic deformation, which induces a deeper, higher-magnitude residual compressive stress field than that induced by conventional SP [11,14]. Generation of surface hardness caused layers via plastic deformation caused multiplication by grain refinement and Nowadays, technique has been usedNowadays, increasinglythis to improve the plain fatigue and increasingly wear resistance dislocation this multiplication technique has been used to performance of mechanical components [11,16,17,18,19].
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