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<p>This present work aims to mitigate the abrasive and adhesive wear of piston ring-cylinder liner pairs in gas storage compressors by enhancing the lubrication and wear resistance of PTFE/42CrMo friction pairs through the synergistic application of laser shock peening and surface texturing. The 42CrMo cylinder liner specimens underwent laser shock peening treatment using a pulse energy of 5&#xa0;J, spot diameter of 3&#xa0;mm, pulse width of 10 ns, and an overlap ratio of 50%. Uniformly distributed circular dimples, approximately 800&#xa0;μm in diameter, 100&#xa0;μm in depth, and covering 20% of the surface area, were subsequently fabricated on the laser shock peen-treated surfaces using a laser texturing process. Friction and wear tests were performed on PTFE/42CrMo piston ring-cylinder liner pairs using a UMT high-frequency linear reciprocating module under a simulated load of 200&#xa0;N, a frequency of 5&#xa0;Hz, and lubrication with ISO VG 32 oil containing 1% solid dust particles (10–20&#xa0;μm). The tribological performance under the combined effects of laser shock peening, surface texturing, and their synergy was evaluated based on friction coefficient, wear rate, and wear morphology. The results indicate that the untreated specimen exhibited an average friction coefficient of 0.140 and a total wear rate of 0.1792 mm<sup>3</sup>/N-m. After the laser peen texturing treatment, the friction coefficient decreased to 0.064 and the total wear rate to 0.1242 mm<sup>3</sup>/N-m, representing approximately a 54% reduction in friction and a 31% improvement in wear resistance. These improvements are attributed to the functional coupling and synergy between the laser surface texturing and laser shock peening. The textured dimples trapped and retained abrasive particles and lubricants, reducing abrasive wear, while the laser shock peening induced residual compressive stress that suppressed crack initiation, reduced adhesive wear, and increased surface hardness. Further analysis indicates that the synergistic effect is mainly wear-dominant, whereas the functional coupling mechanism is primarily friction-dominant. Overall, the combined treatment significantly enhances tribological performance and provides an effective approach for extending the service life of piston ring-cylinder liner assemblies operating under complex and severe conditions.</p>

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Influence of Combined Laser Shock Peening and Surface Texturing on Tribological Performance of Gas Compressor Piston Ring-cylinder Liner Assembly

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Julius Caesar Puoza,
  • Tainyao Zhang,
  • Abdulai Musah,
  • Awudu Ibrahim,
  • Yakubu Kuusana

摘要

This present work aims to mitigate the abrasive and adhesive wear of piston ring-cylinder liner pairs in gas storage compressors by enhancing the lubrication and wear resistance of PTFE/42CrMo friction pairs through the synergistic application of laser shock peening and surface texturing. The 42CrMo cylinder liner specimens underwent laser shock peening treatment using a pulse energy of 5 J, spot diameter of 3 mm, pulse width of 10 ns, and an overlap ratio of 50%. Uniformly distributed circular dimples, approximately 800 μm in diameter, 100 μm in depth, and covering 20% of the surface area, were subsequently fabricated on the laser shock peen-treated surfaces using a laser texturing process. Friction and wear tests were performed on PTFE/42CrMo piston ring-cylinder liner pairs using a UMT high-frequency linear reciprocating module under a simulated load of 200 N, a frequency of 5 Hz, and lubrication with ISO VG 32 oil containing 1% solid dust particles (10–20 μm). The tribological performance under the combined effects of laser shock peening, surface texturing, and their synergy was evaluated based on friction coefficient, wear rate, and wear morphology. The results indicate that the untreated specimen exhibited an average friction coefficient of 0.140 and a total wear rate of 0.1792 mm3/N-m. After the laser peen texturing treatment, the friction coefficient decreased to 0.064 and the total wear rate to 0.1242 mm3/N-m, representing approximately a 54% reduction in friction and a 31% improvement in wear resistance. These improvements are attributed to the functional coupling and synergy between the laser surface texturing and laser shock peening. The textured dimples trapped and retained abrasive particles and lubricants, reducing abrasive wear, while the laser shock peening induced residual compressive stress that suppressed crack initiation, reduced adhesive wear, and increased surface hardness. Further analysis indicates that the synergistic effect is mainly wear-dominant, whereas the functional coupling mechanism is primarily friction-dominant. Overall, the combined treatment significantly enhances tribological performance and provides an effective approach for extending the service life of piston ring-cylinder liner assemblies operating under complex and severe conditions.