Abstract
Experiments were conducted under a dry gross fretting regime. Steel discs were put in contact with ceramic balls. Before tribological tests, discs were subjected to ball burnishing with different pressures. Due to ball burnishing, a decrease in surface amplitude and an increase in microhardness occurred. Ball burnishing caused decreases in the friction force and volumetric wear of up to 45% in comparison to sliding pairs containing milled discs. The friction force and volumetric wear were higher for a higher roughness of disc.
Highlights
Swirad and Pawlus found that ball burnishing caused reductions in wear and friction under dry sliding compared to milled samples [6]
Ball burnishing led to a decrease in the coefficient of friction in lubricated sliding [15], this effect was related to the improvement of surface quality of steel samples
Under the normal load of 30 N, burnishing with the pressure of 30 MPa caused a reduction in the friction coefficient of about 45%
Summary
Studies of the effects of burnishing parameters on surface roughness and hardness were performed [7,8]. As the burnishing process can improve the surface quality, the effects of burnished surfaces on the improvement of functional properties were studied These improvements are mostly connected with a hardness increase and a decrease in roughness height. Swirad and Pawlus found that ball burnishing caused reductions in wear and friction under dry sliding compared to milled samples [6]. Ball burnishing led to a decrease in the coefficient of friction in lubricated sliding [15], this effect was related to the improvement of surface quality of steel samples. The obtained effects of surface roughness on fretting wear and friction were sometimes contradictory.
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