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<p>Laser additive manufacturing of ceramic–metal composites offers potential for wear-resistant applications. However, precise surface finishing is crucial to improve the conformity between mating parts, enhance resistance to corrosion and fatigue, and minimize friction. This study presents the use of a line laser beam obtained with a cylindrical lens for surface polishing of laser-deposited ceramic–metal composite of NiCrSiBC-60% WC and investigates the effect of scanning direction and scan speed on the surface roughness, as well as resulting hardness and wear resistance. Surface polishing was better when the polishing direction was parallel to the cladding direction compared to the perpendicular direction since, in the former case, the line beam melts several peaks and valleys simultaneously, resulting in better spreading of the molten material. Further improvement in the surface roughness was obtained by reducing the scan speed while keeping the polishing and cladding direction the same, facilitating better molten metal spreading between peaks and valleys. The optimum surface roughness (Ra) improvement achieved was 94.67%, from 16.7&#xa0;μm ± 1.42 of the as-deposited specimen to 0.89&#xa0;μm ± 0.14 after polishing. However, the decreased speed aggravated the WC dissolution, deteriorating the wear resistance. The findings are elucidated through various metallurgical characterizations, such as x-ray diffraction phase analysis and scanning electron microscopy.</p>

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Laser Surface Polishing of Additively Manufactured NiCrSiBC-60WC Ceramic–Metal Composite Using a Line Beam

  • 期刊论文

  • 发表日期：

    2025年5月8日

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  • Abhijit Sadhu,
  • Harikrishnan Ramadas,
  • Bibhu Kalyan Panda,
  • Sagar Sarkar,
  • Ashish Kumar Nath

摘要

Laser additive manufacturing of ceramic–metal composites offers potential for wear-resistant applications. However, precise surface finishing is crucial to improve the conformity between mating parts, enhance resistance to corrosion and fatigue, and minimize friction. This study presents the use of a line laser beam obtained with a cylindrical lens for surface polishing of laser-deposited ceramic–metal composite of NiCrSiBC-60% WC and investigates the effect of scanning direction and scan speed on the surface roughness, as well as resulting hardness and wear resistance. Surface polishing was better when the polishing direction was parallel to the cladding direction compared to the perpendicular direction since, in the former case, the line beam melts several peaks and valleys simultaneously, resulting in better spreading of the molten material. Further improvement in the surface roughness was obtained by reducing the scan speed while keeping the polishing and cladding direction the same, facilitating better molten metal spreading between peaks and valleys. The optimum surface roughness (Ra) improvement achieved was 94.67%, from 16.7 μm ± 1.42 of the as-deposited specimen to 0.89 μm ± 0.14 after polishing. However, the decreased speed aggravated the WC dissolution, deteriorating the wear resistance. The findings are elucidated through various metallurgical characterizations, such as x-ray diffraction phase analysis and scanning electron microscopy.