【摘要】 正弦表面织构可有效提升表面摩擦性能和涂层结合性能。为明确激光加工参数对正弦型微织构成形性的影响，采用纳秒激光器在40Cr钢表面进行了织构加工，并采用三维形貌仪、扫描电子显微镜等对正弦织构的结构参数和成形质量进行表征。分析了激光功率、扫描速度、脉冲频率和扫描重复次数对正弦织构成形规律的影响。结果表明，随激光功率、脉冲频率和扫描重复次数增加，或激光扫描速度降低，正弦织构的结构参数增大。正弦织构波峰和波谷位置，曲线内侧的边缘凸起尺寸大于外侧。为避免正弦织构变成离散的凹坑，扫描速度应不高于1 000 mm/s;当脉冲频率控制在15～65 kHz,激光扫描重复次数控制在3～13次时，可避免正弦织构被溅射金属堵死或形成过浅的正弦织构。更多还原

【Abstract】 Sinusoidal surface texture can effectively improve surface friction performance and coating adhesion performance, to clarify the effects of laser processing parameters on the formability of sinusoidal microtexture, nanosecond lasers were used for texture preparation on 40Cr steel. The structural parameters and forming quality of the sinusoidal texture were characterized using three-dimensional morphometers, SEM, etc. And then, the effects of laser power, scanning speed, pulse frequency, and scanning repetition times on the forming regularity of sinusoidal texture were analyzed. Results show that the structural parameters of the sinusoidal texture increase with higher laser power, pulse frequency, and scanning repetition times, or with lower laser scanning speeds. At the peaks and valleys of the sinusoidal texture, the inner side bulges are larger than those on the outside. To prevent the sinusoidal texture from becoming discrete dimples, the scanning speed should not surpass 1000 mm/s. Maintaining the pulse frequency between 15 kHz and 65 kHz, and adjusting the number of laser scanning repetitions from 3 to 13, can prevent the sinusoidal texture from being blocked by sputtered metal or forming too shallow.更多还原