采用波长为1 030 nm的飞秒激光在0Cr18Ni9不锈钢表面上制备出规则的微型构造,采用HT-500高温摩擦磨损机对其进行干摩擦实验研究,利用彩色3D激光扫描显微镜与SEM观察微孔表面形貌以及测量其深度。研究结果表明,飞秒激光能够制备出质量较好的微孔,在同等条件下的干摩擦磨损实验中,微型构造的材料表面比未加工的材料摩擦系数要小。在载荷为5 N,滑动速度为0.075 0,0.018 7 m/s条件下,面积比率约为10%的微型构造表面摩擦系数比未处理表面摩擦系数减小15.8%、40.4%。在载荷为9 N,滑动速度为0.075 0,0.018 7 m/s条件下,面积比率约为10%的微型构造表面摩擦系数比未处理表面摩擦系数减小19.3%与24.7%。不同尺寸微型构造表面摩擦磨损研究发现,微孔直径为60μm的表面摩擦系数要比直径为28 μm的表面要低,当载荷分别为5 N和9 N时,面积比率约为10%和20%的微型构造表面摩擦系数最低,磨损机制主要为粘着磨损和磨粒磨损。

The rule of the micro-structure on 0Cr18Ni9 stainless steel were produced with a wavelength of 1 030 nm of femtosecond laser. Friction tests were performed through using HT-500 wear machine. The morphology of micro-dimpleand its depth were observed and measured using SEM and a 3D laser scanning microscope. The results show that the regular micro-dimple produced on the surface by femtosecond laser had a better quality of morphology. Laser-textured micro-structure exhibited lower friction coefficient than untextured surface under the same conditions of dry friction experiment. When the load is 5 N and sliding velocity is 0.075 0, 0.018 7 m/s respectively, the friction coefficient of the micro-structure surface with the area ratio of 10% decreased 15.8% and 40.4% respectively as compared with untextured surfaces. when the load is 9N and sliding velocity is 0.075 0, 0.018 7 m/s respectively, the friction coefficient of the micro-structure surface with the area ratio of 10% decreased 19.3% and 24.7% respectively as compared with untextured surfaces. The effects of micro-dimple diameter and micro-dimple area rate on the tribological properties were also investigated. It was found that the micro-structure surface with the diameter of 60 μm had a lower friction coefficient than the micro-structure surface with the diameter of 28 μm. When the load is 5 N and 9 N respectively, the micro-structure surface with the area ratio of 10% and 20% exhibited the lowest friction coefficient. The wear mechanism is adhesive wear and abrasive wear.