皮秒激光微变形工艺增强Ti-6Al-4V合金的耐磨性

摘要

采用波长为532 nm的脉冲皮秒Nd:YAG激光器对5级钛合金(Ti-6Al-4V)表面进行织构,使其磨损率降至最低.通过在滑动条件下用盘式销状设备进行磨损试验,分析了基体试样和激光表面织构试样的磨损性能.采用Box-Benhken设计方法进行了磨损试验,并采用响应面法分析了工艺参数之间的相互作用.通过改变载荷、圆盘转速和轨道直径,在室温下,以1500 m为滑动距离,进行了磨损分析.结果表明,与非织构表面相比,激光织构表面具有较低的摩擦系数和良好的耐磨性能.利用方差分析方法建立了钛合金磨损分析的回归模型.分析还发现,载荷和滑动距离是对磨损性能影响最大的参数,其次是磨损径迹直径.根据数值优化的结果,提出了优化的操作条件.%A pulsed, picosecond Nd:YAG laser with a wavelength of 532 nm is used to texture the surface of grade 5 titanium alloy (Ti-6Al-4V) for minimizing its wear rate. The wear properties of the base samples and laser surface textured samples are analyzed by conducting wear tests under a sliding condition using pin-on-disk equipment. The wear tests are conducted based on the Box-Benhken design, and the interaction of the process parameters is analyzed using response surface methodology. The wear analysis is conducted by varying the load, rotating speed of the disc, and track diameter at room temperature with a sliding distance of 1500 m. The results demonstrate that the laser textured surfaces exhibited a lower coefficient of friction and good anti-wear properties as compared with the non-textured surfaces. A regression model is developed for the wear analysis of titanium alloy using the analysis of variance technique. It is also observed from the analysis that the applied load and sliding distance are the parameters that have the greatest effect on the wear behavior followed by the wear track diameter. The optimum operating conditions have been suggested based on the results obtained from the numerical optimization approach.