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<p>This study investigates the synergetic effects of hexagonal boron nitride (h-BN) and laser surface texturing on GCr15 and Cr-Ni austenitic stainless steels (SS 316L and SS 304), analyzing friction and wear with varying dimple pitch distances. An Nd: YAG laser with a wavelength of 1064&#xa0;nm and a pulse duration of 5&#xa0;ns was used in the texturing procedure. Textured surfaces were assessed for morphology, roughness, and wettability, and their tribological performance was tested using a ball-on-disk tribometer under both dry and lubricated conditions (i.e., PAO-4 and PAO-4 + 1% wt h-BN nanoparticles). The contact angle test using PAO-4 oil showed that P-100 (39.31°) exhibited superior oil spreading compared to U-T (84.19°), P-150 (71.52°), and P-200 (77.8°) surfaces. The range of analysis identified 100&#xa0;µm (P-100) as the optimal dimple pitch, with the GCr15 surface exhibiting the best tribological performance. It achieved CoF reductions of 15.3% under dry conditions, and 62.4% and 78.1% under lubricated conditions. The wear coefficient decreased by 50.9% in dry, 65.3% with PAO-4, and 87.1% with PAO-4 + 1% wt h-BN NPs compared to U-S. The analysis considered factors such as wear debris trapping, the contact area between sliding surfaces, and the presence of h-BN as a solid lubricant, all of which influence low friction and improve wear properties. This investigation highlights the potential of laser texturing combined with solid lubricants to enhance metal tribological characteristics, benefiting surface engineering applications across industries.</p>

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Comparative Study on Tribological Performance of Laser Textured GCr15, SS 316L, and SS 304 under Dry and Lubricated Sliding with Hexagonal Boron Nitride Nanoparticles

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Turali Narayana,
  • Fayaz Ahmad Mir,
  • Sunil Kumar Tiwari,
  • Akula Umamaheswara Rao,
  • Shahid Saleem,
  • Dowluru Sreeramulu,
  • Srihari Palli

摘要

This study investigates the synergetic effects of hexagonal boron nitride (h-BN) and laser surface texturing on GCr15 and Cr-Ni austenitic stainless steels (SS 316L and SS 304), analyzing friction and wear with varying dimple pitch distances. An Nd: YAG laser with a wavelength of 1064 nm and a pulse duration of 5 ns was used in the texturing procedure. Textured surfaces were assessed for morphology, roughness, and wettability, and their tribological performance was tested using a ball-on-disk tribometer under both dry and lubricated conditions (i.e., PAO-4 and PAO-4 + 1% wt h-BN nanoparticles). The contact angle test using PAO-4 oil showed that P-100 (39.31°) exhibited superior oil spreading compared to U-T (84.19°), P-150 (71.52°), and P-200 (77.8°) surfaces. The range of analysis identified 100 µm (P-100) as the optimal dimple pitch, with the GCr15 surface exhibiting the best tribological performance. It achieved CoF reductions of 15.3% under dry conditions, and 62.4% and 78.1% under lubricated conditions. The wear coefficient decreased by 50.9% in dry, 65.3% with PAO-4, and 87.1% with PAO-4 + 1% wt h-BN NPs compared to U-S. The analysis considered factors such as wear debris trapping, the contact area between sliding surfaces, and the presence of h-BN as a solid lubricant, all of which influence low friction and improve wear properties. This investigation highlights the potential of laser texturing combined with solid lubricants to enhance metal tribological characteristics, benefiting surface engineering applications across industries.