The Study of Micro-grating and Micro-square-column on Frictional Resistance Reduction of 316L Stainless Steel Surface

摘要

To reduce the frictional resistance and degree of wear on the surface of 316L stainless steel, three kinds of grating structures and square-column structures in different densities were textured with by nanosecond-laser on the surface of 316L stainless steel. The frictional characteristics on the smooth and textured surfaces were examined by the UMT-2 friction and wear test machine; the grating structures, square-column structures and wear scratches were observed by TOYOTA microscope; the mechanisms concerning frictional changes of grating structure and square-column structure were then analyzed. Research results show that the changes of frictional resistances of grating structure and square-column structure are more stable than that on the smooth surface, which means the former can stabilize the frictional resistance. As the friction time extends, the frictional resistance of smooth surface increase sharply, while the frictional resistance of grating structure and square-column structure remain small and unchanged. Therefore, the denser the grating structure and square-column structure, the smaller the frictional resistance. The experiments give rise to the conclusion that the grating structure and square-column structure can capture stereoplasm particles and store lubricating oil, which can produce secondary lubrication effect and retain the continuity of oil film under oil-poor conditions. Denser grating structure and square-column structure is prone to generate better fluid dynamic pressure effect and improve the bearing capacity. In addition, grating structure is superior to the square-column structure in the reduction of frictional resistance.