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<p>Laser surface texturing is an advanced fabrication technique employed to create microfeatures on material surfaces, enhancing their tribological properties. This study investigates the use of femtosecond laser surface texturing (100&#xa0;fs pulse duration, 800&#xa0;nm wavelength) to produce micro-crosshatch patterns on gray cast iron substrates, with the objective of improving friction and wear performance. The effects of critical process parameters, including texture density and aspect ratio, on tribological behavior were systematically examined. Surface morphology and topography were characterized using opto-digital 3D microscopy and field emission scanning electron microscopy (FESEM). Structural and morphological alterations in the textured gray cast iron surfaces, including the exposure of open-structured graphite flakes and the formation of graphite films within the textured regions, were observed. Tribological performance was evaluated under dry sliding conditions using a ball-on-disk reciprocating tribometer. The laser-textured surfaces demonstrated a substantial reduction in the coefficient of friction—up to 90%—compared to untextured surfaces, along with significantly reduced wear debris and smoother wear scars. The optimal tribological performance was achieved with texture configurations having a density of 60% and an aspect ratio of 0.06. These findings highlighting the potential of femtosecond laser surface texturing for engineering advanced tribological surfaces.</p>

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Femtosecond Laser Surface Textured Micro-Crosshatch Patterns for Tribological Enhancement of Gray Cast Iron

  • 期刊论文

  • 发表日期：

    2025年4月12日

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  • D. Nazeer Basha,
  • G. L. Samuel,
  • Ravi Bathe

摘要

Laser surface texturing is an advanced fabrication technique employed to create microfeatures on material surfaces, enhancing their tribological properties. This study investigates the use of femtosecond laser surface texturing (100 fs pulse duration, 800 nm wavelength) to produce micro-crosshatch patterns on gray cast iron substrates, with the objective of improving friction and wear performance. The effects of critical process parameters, including texture density and aspect ratio, on tribological behavior were systematically examined. Surface morphology and topography were characterized using opto-digital 3D microscopy and field emission scanning electron microscopy (FESEM). Structural and morphological alterations in the textured gray cast iron surfaces, including the exposure of open-structured graphite flakes and the formation of graphite films within the textured regions, were observed. Tribological performance was evaluated under dry sliding conditions using a ball-on-disk reciprocating tribometer. The laser-textured surfaces demonstrated a substantial reduction in the coefficient of friction—up to 90%—compared to untextured surfaces, along with significantly reduced wear debris and smoother wear scars. The optimal tribological performance was achieved with texture configurations having a density of 60% and an aspect ratio of 0.06. These findings highlighting the potential of femtosecond laser surface texturing for engineering advanced tribological surfaces.