Abstract
In order to optimize the process parameters of high residual stress on the surface of Ti-6Al-4V alloy sheet which is obtained after ultrasonic rolling, the effects of static pressure, ultrasonic rolling amplitude and time on surface residual stress are investigated. Firstly, the ultrasonic rolling experiment was carried out under different static pressure conditions, and then the distribution of residual stress on the specimen surface was measured. Further, based on Abaqus/Explicit, a three-dimensional finite element (FE) model was established to simulate the ultrasonic rolling process. The distribution of residual stress on the surface was also analyzed with different static pressure, ultrasonic rolling amplitude and time. The reliability of the model under different static pressure parameters was verified in the aspects of residual stress, size and thickness of the hardening layer. The simulation results were in good agreement with the experimental results. The FE results show that the compressive residual stress increased first and then decreased along with the rolling depth direction, and then transformed into tensile residual stress. The residual stress increased with the increase of static pressure and amplitude, and it decreased first and then increased with the increase of time. According to the FE results, higher residual stress is obtained when the static force, ultrasonic amplitude and time are set to 1100 N, 10 μm and 0.065 s, respectively, which contributes to the improvement of fatigue life. This study could guide the selection of the processing parameters of the ultrasonic surface rolling in Ti-6Al-4V alloy.
Published Version
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