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Experimental Analysis of Microstructured Steel Surfaces for Wet Tribological Applications in the Low Velocity Regime

机译：低速状态下湿摩擦学应用的微结构钢表面的实验分析

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The surface topography plays an important role in the design of a function-optimised surface. Therefore, the influence of topography with microsized structures produced by laser surface texturing (LST) is experimentally examined under lubricated sliding conditions. The structured specimens were made of AISI 51200 (DIN 100Cr6) hardened to about 800 HV. Concerning the requirements of tribological testing without any debris caused by the preprocessing, the structuring was carried out using a picosecond laser system (Trumpf TruMicro) with 6 ps pulse duration. A laboratory pin-on-disc tribometer (Plint TE-92 HS) was used for the tests, which were run under wet conditions with counterbodies made of bronze and steel at a nominal contact pressure of up to 4 MPa and sliding speeds between 0.04 and 2.0 m/s. Furthermore, start-stop cycles with accelerating and decelerating shares were used to simulate an automotive start-stop system. In the tribological experiments, a significant reduction of the friction coefficient was observed compared to sliding pairs without microstructured pin surfaces. Whereas no measureable wear occurred on the steel pins and discs, the bronze discs showed a significant amount of wear and the microstructures on the pin surfaces mated against bronze discs were almost completely filled with wear debris.
机译：表面形貌在功能优化表面的设计中起着重要作用。因此，在润滑的滑动条件下，通过实验检查了由激光表面纹理化（LST）产生的微细结构对形貌的影响。结构化试样由AISI 51200（DIN 100Cr6）制成，硬化至约800 HV。关于摩擦学测试的要求，没有预处理造成的任何杂物，结构化使用的是皮秒激光系统（Trumpf TruMicro），脉冲持续时间为6 ps。测试使用实验室针式圆盘摩擦计（Plint TE-92 HS），该测试在潮湿条件下与青铜和钢制counter体在标称接触压力高达4 MPa且滑动速度介于0.04和0.54之间的条件下运行。 2.0 m / s。此外，使用具有加速和减速份额的启停循环来模拟汽车启停系统。在摩擦学实验中，与没有微结构销表面的滑动副相比，摩擦系数显着降低。尽管钢制销钉和圆盘上没有发生可测量的磨损，但青铜色圆盘显示出明显的磨损，并且与青铜色圆盘配合的销钉表面上的微结构几乎完全充满了磨损碎片。

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