对钛合金进行抛光可以优化表面质量、提高耐磨损性能和使用寿命。运用纳秒脉冲光纤激光器进行钛合金Ti6Al4V抛光实验, 通过光学轮廓仪测量不同激光光束形状、脉冲能量密度、光斑重叠率、脉冲宽度下的钛合金Ti6Al4V工件表面粗糙度变化规律。结果表明:平顶光束能够达到的粗糙度更小, 激光脉冲能量密度增大, 凸起消融越多, 工件表面粗糙度减小; 光斑重叠率增大, 粗糙度减小, 重叠率过大, 受热应力的影响, 凝固后的表面变得不平滑, 粗糙度增大; 一定范围内的脉冲宽度的增加, 凸起消融越多, 粗糙度减小。研究结果对提高钛合金抛光效率, 优化钛合金性能有促进作用。

Laser polishing of titaniμm alloys can optimize their surface quality, improve wear resistance, and improve the service life of titaniμm alloys. Titaniμm alloy Ti6Al4V polishing experiments were performed using a pulsed fiber laser. An optical surface profiler was used to measure the variation of surface roughness of titaniμm alloy Ti6Al4V materials with different beam shape, average laser power, spot overlap ratio, and repetition frequency. The results show that the flat top beam can achieve less roughness, the laser pulse energy density increases, the more the convex ablation, the surface roughness of the workpiece decreases; the spot overlap rate increases, the roughness decreases, and the overlap rate is too large. Under the influence of thermal stress, the surface after solidification becomes unsmooth, the roughness increases; the pulse width increases within a certain range, the more the convex ablation, the less the roughness. The research results have an effect on improving the polishing efficiency of titanium alloy and optimizing the performance of titanium alloy.