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Article

Influence of Sulphur Content on Structuring Dynamics during Nanosecond Pulsed Direct Laser Interference Patterning

1
Institute of Manufacturing Technology, Technische Universität Dresden, P.O. Box, 01062 Dresden, Germany
2
Fraunhofer Institute for Material and Beam Technology IWS, Winterbergstr. 28, 01277 Dresden, Germany
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Jörn Bonse and Koji Sugioka
Nanomaterials 2021, 11(4), 855; https://doi.org/10.3390/nano11040855
Received: 26 February 2021 / Revised: 16 March 2021 / Accepted: 25 March 2021 / Published: 27 March 2021
(This article belongs to the Special Issue Laser-Generated Periodic Nanostructures)
The formation of melt and its spread in materials is the focus of many high temperature processes, for example, in laser welding and cutting. Surface active elements alter the surface tension gradient and therefore influence melt penetration depth and pool width. This study describes the application of direct laser interference patterning (DLIP) for structuring steel surfaces with diverse contents of the surface active element sulphur, which affects the melt convection pattern and the pool shape during the process. The laser fluence used is varied to analyse the different topographic features that can be produced depending on the absorbed laser intensity and the sulphur concentration. The results show that single peak geometries can be produced on substrates with sulphur contents lower than 300 ppm, while structures with split peaks form on higher sulphur content steels. The peak formation is explained using related conceptions of thermocapillary convection in weld pools. Numerical simulations based on a smoothed particle hydrodynamics (SPH) model are employed to further investigate the influence of the sulphur content in steel on the melt pool convection during nanosecond single-pulsed DLIP. View Full-Text
Keywords: direct laser interference patterning; periodic microstructure; sulphur content; nanosecond pulse; surface tension gradient; Marangoni convection; smoothed particle hydrodynamics direct laser interference patterning; periodic microstructure; sulphur content; nanosecond pulse; surface tension gradient; Marangoni convection; smoothed particle hydrodynamics
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MDPI and ACS Style

Jähnig, T.; Demuth, C.; Lasagni, A.F. Influence of Sulphur Content on Structuring Dynamics during Nanosecond Pulsed Direct Laser Interference Patterning. Nanomaterials 2021, 11, 855. https://doi.org/10.3390/nano11040855

AMA Style

Jähnig T, Demuth C, Lasagni AF. Influence of Sulphur Content on Structuring Dynamics during Nanosecond Pulsed Direct Laser Interference Patterning. Nanomaterials. 2021; 11(4):855. https://doi.org/10.3390/nano11040855

Chicago/Turabian Style

Jähnig, Theresa, Cornelius Demuth, and Andrés F. Lasagni 2021. "Influence of Sulphur Content on Structuring Dynamics during Nanosecond Pulsed Direct Laser Interference Patterning" Nanomaterials 11, no. 4: 855. https://doi.org/10.3390/nano11040855

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