Abstract
Various textures are fabricated by a picosecond laser machine on the surfaces of circular stainless steel specimens. Vibrational and tribological effects of laser surface textures are investigated by means of a tribometer and a data acquisition and signal processing (DASP) system. Experimental results show that surface textures can reduce the coefficients of friction (COFs), enhance the wear resistance, and improve the dynamical performance of frictional surfaces. In this study, the surface with micro circular dimples in diameter of 150 μm or textured area density of 25% has the best tribological and dynamical performance. Compared with the non-textured surface, the surface with circular dimples in diameter of 150 μm and 15% textured area density has 27% reduction of COFs, 95% reduction of frictional vibrations, and 66% reduction of frictional noise. The frictional vibrations and noise in the sliding contacts can be effectively reduced by adding graphene to the lubrication oil, and the surface textures enhance the frictional noise reduction performance of lubrication.
Highlights
The phenomenon of friction and wear exists everywhere in the world, where there are surfaces in relative motion [1]
The results showed that the hexagonal texture processed by laser (HT-L) exhibited lower friction coefficient and less friction fluctuation than the similar surface hardness generated by conventional heat treatment but without hardness gradient (HT-H) and smooth surface treated by the same laser heat treatment as the HT-L (SS-L surfaces)
Experimental studies have been carried out to investigate the effects of laser surface texturing (LST) and lubrication with graphene on the tribological and dynamical performance of non-conformal sliding contacts
Summary
The phenomenon of friction and wear exists everywhere in the world, where there are surfaces in relative motion [1]. Various functional materials were used in these studies, including steels [8,9,10,11,12,13,14,15,16], cast iron [17,18,19], alloys [20,21,22], and compound materials [23,24], etc The results of these experimental studies showed that LST had a positive effect on the reduction of friction and wear. The reciprocating sliding tests of lubricated steel surfaces for a line contact under low contact pressures did not show positive effects of surface texturing on friction [26], and the pin-on-disk tests (unidirectional sliding) under full film lubrication [27], surface texturing slightly increased the film thickness [26]
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