Comparative experimental study on effects of conventional and ultrasonic deep cold rolling processes on Ti-6Al-4V

The present paper presents the experimental studies on the treatment of Ti-6Al-4V using conventional and ultrasonic deep cold rolling (CDCR and UDCR) processes. The UDCR process is a novel technique in which the ultrasonic technology was incorporated into the concept of the CDCR process, which enables use of superimposed dynamic forces onto considerably reduced static forces applied on a part surface during treatments by UDCR. Considerable improvements in surface topography and near surface characteristics of treated material were achieved in the present study. Both processes exhibited comparable results in surface finish and induced compressive residual stresses, while the UDCR process produced superior results than the CDCR process in work hardening. The investigations suggest that the UDCR process could provide technological benefits for the treatment of thin walled aerospace components to be carried out without geometry distortion, which would lead to improved fatigue life and resistance to failure mechanisms.