EFFECT OF SEVERE AIR-BLAST SHOT PEENING ON THE WEAR CHARACTERISTICS OF CP TITANIUM

Abstract

In this study, air-blast shot peening was applied to analyze the wear characteristics of CP titanium (Grade II). The specimens were exposed to different plastic-deformation rates via different severe shot-peening conditions in order to determine the wear behaviour of CP titanium. A free-ball micro-abrasion test was performed on the specimens shot peened with different Almen intensities. Nanohardness measurements were also performed to investigate the work-hardened layer - the coarse-grained-structure transition zone. Light microscopy and scanning electron microscopy (SEM) were used to analyze both the wear tracks and the severely deformed layer. As a result, the plastically deformed layer thickness reaches approximately 100 mu m beneath the surface. Moreover, the hardness and wear durability after severe shot peening is increased.