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

Theresa Jähnig1, Cornelius Demuth1, Andrés Fabián Lasagni1,2

  • 1Institute of Manufacturing Technology, Technische Universität Dresden, P.O. Box, 01062 Dresden, Germany.

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|April 3, 2021
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Summary
This summary is machine-generated.

Direct laser interference patterning (DLIP) creates distinct steel surface structures based on sulfur content. Higher sulfur levels result in split peak geometries, while lower levels yield single peaks, impacting melt pool dynamics.

Keywords:
Marangoni convectiondirect laser interference patterningnanosecond pulseperiodic microstructuresmoothed particle hydrodynamicssulphur contentsurface tension gradient

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Laser Processing

Background:

  • Melt formation and spreading are critical in high-temperature processes like laser welding and cutting.
  • Surface-active elements, such as sulfur, significantly influence melt pool dynamics by altering surface tension gradients.

Purpose of the Study:

  • To investigate the application of direct laser interference patterning (DLIP) for structuring steel surfaces.
  • To analyze the effect of varying sulfur concentrations on melt convection patterns and pool shapes during DLIP.
  • To correlate laser fluence with topographic features and sulfur content.

Main Methods:

  • Direct laser interference patterning (DLIP) was used to structure steel surfaces with varying sulfur content.
  • Laser fluence was systematically varied to study the resulting topographic features.
  • Numerical simulations using a smoothed particle hydrodynamics (SPH) model were employed to understand melt pool convection.

Main Results:

  • Steel substrates with sulfur content below 300 ppm formed single peak geometries.
  • Steels with higher sulfur content (>300 ppm) exhibited split peak structures.
  • The observed peak formations were explained by thermocapillary convection principles in weld pools.

Conclusions:

  • Sulfur concentration is a key factor in determining the microstructural topography generated by DLIP on steel.
  • DLIP offers a method to control surface structuring based on material composition.
  • SPH simulations provide insights into the influence of sulfur on melt pool convection during pulsed laser processing.