微光栅和微方柱织构对316L不锈钢减摩性能的影响

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The surfaces of 316 L stainless steel were textured with different density grating structure and square-column structure by adopting nanosecond-laser. The tribological behaviors of the texture structure were investigated by the UMT-2 friction and wear instrument. The morphology of textured surfaces before and after friction tests were observed by using TOYOTA microscope and the changes in characteristics of friction mechanism of the two textures were analyzed. The results show that the two textures of grating structure and square-column structure have the role of reducing and stabilizing the friction resistance, and stabilizing friction coefficient. The greater the density of the textures are,the smaller of the friction resistance. The hard particles can be captured by all the two textured surfaces, and lubricating oil can be stored in the tex- tured surfaces, with which the secondary lubrication effect can be produced under the condition of oil-poor. The greater the density of the textures are, the more favorable to produce fluid dynamic pressure effect and improve the carrying capacity. The friction reducing effect of grating structure is superior to that of the square-column structure.采用纳秒激光器在316L不锈钢表面织构不同密度的光栅结构和方柱结构；采用UMT-2摩擦磨损试验机考察织构表面的摩擦特性；采用TOYOTA显微镜观察摩擦磨损前后织构的表面形貌；分析2种织构摩擦特性变化的机制。结果表明：光栅和方柱2种结构织构能起到降低和稳定摩擦阻力及稳定摩擦因数的作用；织构越密集，摩擦阻力越小。2种织构表面均能捕获硬质微粒、储存润滑油，在贫油的条件下能产生二次润滑效应；织构越密集，越有利于产生流体动压效应，从而提高承载能力。光栅结构减摩效果优于方柱结构。