Preliminary study of the hardening effect and fatigue behaviour enhancement through vibration assisted ball burnishing on C45 Steel

Abstract

The objective of this paper is to present a preliminary study of the effects of ball burnishing with vibration assistance on cycle fatigue endurance of cylindrical specimens subjected to bending stress and obtain the best input parameters. The specimens were burnished through 6 different combinations of preload force, number of passes and vibration assistance, finding that burnishing while applying a 90-N preload and 5 passes derives in the longest lifespan, being the vibration assistance not significant with this combination. In terms of roughness, it has been proved that the vibration assistance improves the finishing significatively, allowing to reduce the number of passes compared to NVABB and, as optimal ball-burnishing parameters, the 90-N preload and 5 passes combination derivates in a 93% improvement in terms of mean roughness of the surface. It is also been proved the hardening effect provoked by the ball-burnishing, being an improvement estimated around the 51% in the best case.

Fatigue enhancement and hardening effect through ultrasonic vibration‐assisted ball‐burnishing process on AISI 1045 steel

“…A preliminary study with this tool was performed by Velázquez‐Corral et al 33 on AISI 1045 fatigue samples, concluding that the combination of 90‐N and five passes was optimal to enhance the fatigue lifespan and having a fair comparison between VABB and BB. However, the bibliography explains that the increase of the burnishing force derivates in a higher value of the compressive residual stresses, which benefits fatigue resistance 20 .…”