Effect of Ultrasonic Surface Rolling Process on Solid Particles Erosion Performance of Ti-6Al-4V

In this paper, the effect of ultrasonic surface rolling processing (USRP) on the solid particles erosion (SPE) performance of Ti-6Al-4V was studied. USRP is one kind of material surface treatment pro-cessing technology that combines deep rolling processing and ultrasonic vibration, which induces deep levels of compressive residual stresses and nano-crystalline layer with a gradient structure. The material was processed at an annealing temperature of 760°C. During the SPE, three angles of im-pact at 30°, 60°, and 90° are contemplated with an approximate flow capacity of 7±1 kg/h and a maximum exposure time of 100min per specimen, taking measurements of weight intervals around every 5min to determine the mass loss. The wear mechanisms at small angles were mainly: plastic deformation and displacement of material. While at higher impact angles, the mechanisms were mainly: cutting, pitting, fractures, and cracks. After the USRP, the erosion resistance ability of Ti-6Al-4V is increased by 2∼3 times than before, and the influence is more obvi-ous under low impact angle.Transmission electron microscope (TEM) and scanning electron micro-scope (SEM) are used to characterize the microstructure and morphology of the alloy. Cumulative mass loss was utilized to quantify the characterize the erosion resistance.