Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size
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 use...
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doaj-4b766c76e099481b9d96646829ab38a82020-11-24T22:30:25ZengMDPI AGLubricants2075-44422018-01-01611110.3390/lubricants6010011lubricants6010011Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain SizeShiqi Fang0Chia-Jui Hsu1Sven Klein2Luis Llanes3Dirk Bähre4Frank Mücklich5CIEFMA-Departament de Ciència del Materials i Enginyeria Metal.lúrgica, Universitat Politècnica de Catalunya, EEBE—Campus Diagonal Besòs, 08019 Barcelona, SpainInstitute of Functional Materials, Saarland University, 66123 Saarbrücken, GermanyInstitute of Production Engineering, Saarland University, 66123 Saarbrücken, GermanyCIEFMA-Departament de Ciència del Materials i Enginyeria Metal.lúrgica, Universitat Politècnica de Catalunya, EEBE—Campus Diagonal Besòs, 08019 Barcelona, SpainInstitute of Production Engineering, Saarland University, 66123 Saarbrücken, GermanyInstitute of Functional Materials, Saarland University, 66123 Saarbrücken, GermanyThe 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.http://www.mdpi.com/2075-4442/6/1/11cemented carbidesultra-short pulse laserlaser surface texturing (LST)surface integritydamage |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Shiqi Fang Chia-Jui Hsu Sven Klein Luis Llanes Dirk Bähre Frank Mücklich |
spellingShingle |
Shiqi Fang Chia-Jui Hsu Sven Klein Luis Llanes Dirk Bähre Frank Mücklich Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size Lubricants cemented carbides ultra-short pulse laser laser surface texturing (LST) surface integrity damage |
author_facet |
Shiqi Fang Chia-Jui Hsu Sven Klein Luis Llanes Dirk Bähre Frank Mücklich |
author_sort |
Shiqi Fang |
title |
Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size |
title_short |
Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size |
title_full |
Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size |
title_fullStr |
Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size |
title_full_unstemmed |
Influence of Laser Pulse Number on the Ablation of Cemented Tungsten Carbides (WC-CoNi) with Different Grain Size |
title_sort |
influence of laser pulse number on the ablation of cemented tungsten carbides (wc-coni) with different grain size |
publisher |
MDPI AG |
series |
Lubricants |
issn |
2075-4442 |
publishDate |
2018-01-01 |
description |
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. |
topic |
cemented carbides ultra-short pulse laser laser surface texturing (LST) surface integrity damage |
url |
http://www.mdpi.com/2075-4442/6/1/11 |
work_keys_str_mv |
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