<p>Inconel 718 components with intricate geometries may be fabricated using direct metal laser sintering (DMLS) for use in energy and aerospace applications; however, wear behavior can be significantly impacted by process-induced microstructural anisotropy and surface heterogeneity. In this study, a pin-on-disk was used to analyze the tribological behavior of Inconel 718 produced by DMLS in both dry and oil-lubricated sliding conditions. A L<sub>9</sub> orthogonal array was used with sliding distances of 1000-2000&#xa0;m, sliding velocities of 1-3&#xa0;m/s, and applied load of 10-30 N to analyze the wear rate, specific wear rate, coefficient of friction (CoF), and frictional force. Scanning electron microscopy and energy-dispersive spectroscopy were used to describe the worn surfaces. In dry sliding circumstances, the specific wear rate increased from 1.13 × 10<sup>−4</sup> to 2.09 × 10<sup>−4</sup>&#xa0;mm/N·m as the load increased, while the wear rate increased from 0.001043 to 0.001283 mm<sup>3</sup>/m with increasing sliding velocity. As the sliding distance increased, progressive surface degradation was seen, including tribo-oxidation, delamination, and abrasive grooving. On the other hand, oil lubrication limited the frictional force to less than 5.84 N, constrained the CoF to 0.203-0.234, and decreased the wear rate to 0.00117 mm<sup>3</sup>/m. Microstructural investigations showed that under lubricated circumstances, there was less subsurface damage. These results demonstrate how well oil lubrication stabilizes DMLS Inconel 718's tribological response and validate its applicability for wear-critical applications running under boundary conditions.</p>

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A Comparative Analysis of Tribological Performance of DMLS Inconel 718 under Dry and Oil-Lubricated Conditions

  • N. Manikandan,
  • A. Thangarasu,
  • T. S. Senthilkumar,
  • M. Mani

摘要

Inconel 718 components with intricate geometries may be fabricated using direct metal laser sintering (DMLS) for use in energy and aerospace applications; however, wear behavior can be significantly impacted by process-induced microstructural anisotropy and surface heterogeneity. In this study, a pin-on-disk was used to analyze the tribological behavior of Inconel 718 produced by DMLS in both dry and oil-lubricated sliding conditions. A L9 orthogonal array was used with sliding distances of 1000-2000 m, sliding velocities of 1-3 m/s, and applied load of 10-30 N to analyze the wear rate, specific wear rate, coefficient of friction (CoF), and frictional force. Scanning electron microscopy and energy-dispersive spectroscopy were used to describe the worn surfaces. In dry sliding circumstances, the specific wear rate increased from 1.13 × 10−4 to 2.09 × 10−4 mm/N·m as the load increased, while the wear rate increased from 0.001043 to 0.001283 mm3/m with increasing sliding velocity. As the sliding distance increased, progressive surface degradation was seen, including tribo-oxidation, delamination, and abrasive grooving. On the other hand, oil lubrication limited the frictional force to less than 5.84 N, constrained the CoF to 0.203-0.234, and decreased the wear rate to 0.00117 mm3/m. Microstructural investigations showed that under lubricated circumstances, there was less subsurface damage. These results demonstrate how well oil lubrication stabilizes DMLS Inconel 718's tribological response and validate its applicability for wear-critical applications running under boundary conditions.