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Influence on friction behavior of micro-texturing under lubricated non-conformal contact

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Abstract

Laser surface texturing (LST) is a well-known surface engineering process used to create arranged dimples on surface using a material ablation process. In this process, a well arranged micro-dimple can produce significant improvements of engineering components in aspects such as load carrying capacity, wear resistance, wetting characteristics and reduction of friction coefficient. In the present work, we investigated the effect of multi-dimple LST steel surfaces on tribological properties under non-conforming contact. The multi-dimple textured surfaces with some specific formula arrays were fabricated by laser ablation process on steel disc by combining patterns of circles and triangles, and circles and squares, having different dimple densities to optimize the surface texturing effect on tribological performance. The tribological test of multi-dimple textured surface was performed by a ball-on-flat unidirectional tribometer in lubricated condition, and the results compared with that of a single-dimple and untextured (polished and ground) surfaces. The results indicate that the surface with multi-dimple textured patterns had better friction performance than the untextured and single-dimple textured surfaces. The beneficial effect of multi-dimple textured patterns was associated with transition of lubrication from boundary to mixed lubrication regime.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0022933). The authors would like to thank Professor Young-Hun Chae and Ho Lee for providing the Nd:YAG laser.

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  1. Department of Mechanical Engineering, Graduate School, Kyungpook National University, Daegu, 702-701, South Korea

    Dawit Zenebe Segu & Seock Sam Kim

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  1. Dawit Zenebe Segu
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  2. Seock Sam Kim
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Correspondence to Seock Sam Kim.

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Segu, D.Z., Kim, S.S. Influence on friction behavior of micro-texturing under lubricated non-conformal contact. Meccanica 49, 483–492 (2014). https://doi.org/10.1007/s11012-013-9806-8

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