Abstract
Laser irradiation yields a powerful tool to modify the symmetry and asymmetry features of materials surfaces. In this paper, femtosecond laser-induced periodic surface structures were applied on stainless steel AISI 314, specially hardened by a low-vacuum carburizing procedure. Symmetry modifications in the surface’s morphology and chemistry before and after the laser treatment were investigated by SEM and EDS, respectively. Coefficient of friction (COF) was observed in dry sliding condition by using block-on-ring sliding test. The results show that COF values are substantially lower after laser-induced periodic surface structures (LIPSS) surface treatment.
Highlights
Friction is responsible for more than 25% of energy consumption in all human areas round the world [1]
Single-step muscless optical patterning techniques exist, notably simple direct laser writing (DLW) [4] and the more complex multi-beam interference [5] and the even more advanced direct laser interference patterning (DLIP) [6]. All these aforementioned laser surface treatments are able to form microscale patterns on the surface and all substantially decrease the coefficient of friction (COF)
We demonstrated that Laser Induced Periodic Surface Structures (LIPSS) of high quality can be obtained on hardened steel
Summary
Friction is responsible for more than 25% of energy consumption in all human areas round the world [1]. Especially snakes have a selected morphology of skin, i.e., they show a synergy between nanoscale and submicron features, allowing for a significant reduction in the friction in dry conditions [2]. Single-step muscless optical patterning techniques exist, notably simple direct laser writing (DLW) [4] and the more complex multi-beam interference [5] and the even more advanced direct laser interference patterning (DLIP) [6] All these aforementioned laser surface treatments are able to form microscale patterns on the surface and all substantially decrease the coefficient of friction (COF). We used samples of stainless steel AISI 314 L specially hardened by low vacuum carburized procedure and modified with LIPSS to reduce coefficient of friction (COF). The LIPSS on stainless steel, in one-fold hardened, were feasible after 10 m of sliding dry test
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