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Lubricants 2018, 6(1), 11; https://doi.org/10.3390/lubricants6010011

Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size

1
CIEFMA-Departament de Ciència del Materials i Enginyeria Metal.lúrgica, Universitat Politècnica de Catalunya, EEBE—Campus Diagonal Besòs, 08019 Barcelona, Spain
2
Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya, 08019 Barcelona, Spain
3
Institute of Production Engineering, Saarland University, 66123 Saarbrücken, Germany
4
Institute of Functional Materials, Saarland University, 66123 Saarbrücken, Germany
This paper is an extended version of our paper published in Sixth World Tribology Congress (WTC 2017).
*
Author to whom correspondence should be addressed.
Received: 6 December 2017 / Revised: 15 January 2018 / Accepted: 16 January 2018 / Published: 20 January 2018
(This article belongs to the Special Issue Selected Papers in the Sixth World Tribology Congress (WTC 2017))
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Abstract

The ultra-short pulse laser has attracted attention as an advanced tool for functionalizing surface topography, since it has high accuracy and results in little damage. In a previous study, some innovative patterns were introduced on cemented carbide surfaces, such as dimples, which are commonly used as oil reservoirs for bearings. The accuracy is not only related to the inherent features of the laser, but also to the machining processes. Within this context, this study aims to investigate the influence of machining parameters (i.e., pulse number in this study) on the ablation mechanism and resulting surface integrity. Two cemented carbide grades, possessing similar chemical composition but different grain size (small and large), are machined using a femtosond laser set-up with variant pulse number (1–20). The geometrical properties of the produced structure and surface integrity are statistically investigated using different microscopy techniques. It is found that the dimple depth is approximately proportional to the pulse number for both grades, and the coarse grade leads to a higher rate of depth increase. Damage is found in the form of melting and cracking for the binder and the grains, respectively; but this is more pronounced for large-grain grade in terms of the scale and depth. However, these observations are only found at a very superficial position. View Full-Text
Keywords: cemented carbides; ultra-short pulse laser; laser surface texturing (LST); surface integrity; damage cemented carbides; ultra-short pulse laser; laser surface texturing (LST); surface integrity; damage
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fang, S.; Hsu, C.-J.; Klein, S.; Llanes, L.; Bähre, D.; Mücklich, F. Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size. Lubricants 2018, 6, 11.

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