An Experimental Investigation on the Effect of Post-Shot Peening on Tribological Behaviors of Mo-Thermal Spray Coating in Synchronizer Rings

Author:  H.Mohassel, M. Zehsaz, H.Vafadar, S.E.Saei, H.Zare
Source:  Conf Proc 2014: ICSP-12 Goslar, Germany (pgs.558-563)
Doc ID:  2014137
Year of Publication:  2014
Abstract:  
We have investigated the influence of post-shot peening on Mo-coating as compared to substrate steel 16MnCr5 (according to ZFN-413 A). Shot peening of carburized discs with and without Mo-coating was performed by using Shot size S230, Almen intensity 0.42mm'A' and exposure time 96 sec. Tribological properties were analyzed, using pin-on-disc tribometer apparatus, under dry sliding conditions at different specific applied loads, sliding velocities and distance. Typical standardized methods were used for studying of surface integrity parameters. Surface morphology of the substrate and Mo-coating specimens with and without Shot peening after wear was evaluated by Scanning Electron Microscope (SEM). The results showed that shot peening after Mo-coating has considerable effect on improving wear resistance and because of having low friction coefficient has showed better wear behavior and tribological properties over that of the un-peened Mo-coating.