Abstract
We report on the effect of femtosecond-laser-induced periodic surface structures (LIPSS) on the tribological properties of stainless steel. Uniform periodic nanostructures were produced on AISI 304L (American Iron and Steel Institute steel grade) steel surfaces using an 800-nm femtosecond laser. The spatial periods of LIPSS measured by field emission scanning electron microscopy ranged from 530 to 570 nm. The tribological properties of smooth and textured surfaces with periodic nanostructures were investigated using reciprocating ball-on-flat tests against AISI 440C balls under both dry and starved oil lubricated conditions. The friction coefficient of LIPSS covered surfaces has shown a lower value than that of the smooth surface. The induced periodic nanostructures demonstrated marked potential for reducing the friction coefficient compared with the smooth surface.
Highlights
It is well known that surface texturing is an effective way of improving tribological properties under both dry and lubricated conditions [1,2,3]
Femtosecond laser surface texturing seems to be the most advanced method of surface texturing for tribological applications
Laser-induced periodic surface structures (LIPSS) have gained remarkable interest because they enable tuning of a wide range of properties, including wettability [14], colorization [15], and tribological properties [16,17,18]
Summary
It is well known that surface texturing is an effective way of improving tribological properties under both dry and lubricated conditions [1,2,3]. Various surface texturing technologies, such as mechanical machining, lithography, ion beam texturing, and laser texturing [7,8,9,10] have been developed for preparing the micrometer-sized features on the surface of materials Among these techniques, femtosecond laser surface texturing seems to be the most advanced method of surface texturing for tribological applications. The results indicated that the LIPSS of the steel did not significantly reduce the friction coefficient compared with smooth surface (no LIPSS) under lubricated condition We consider it necessary to further investigate the effects of the LIPSS of steels on tribological properties under both dry and lubricated conditions. The effects of LIPSS on the tribological properties were investigated by performing reciprocating ball-on-flat tests against AISI 440C (American Iron and Steel Institute steel grade) steel balls under both dry and lubricated conditions. Our findings may suggest applications in fields including magnetic storage and microelectromechanical systems (MEMS)
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