(大连海事大学 机械工程系，大连 116026)
摘 要: 采用激光表面改性的方法对Ti6Al4V合金进行纹理加工。采用表面粗糙度测试仪、接触角测量仪和X射线衍射仪对激光纹理加工试样的表面特性进行表征，采用磁致伸缩超声振动仪对试样的抗空蚀特性进行测试，采用光学显微镜和扫描电子显微镜对试样空蚀前、后的表面形貌进行观测。结果表明：经激光表面纹理加工，试样的硬度由337HV提高到550HV，水接触角增大10˚；激光纹理加工试样的抗空蚀特性有所改善，特别是对于具有较小间距网格形状的表面纹理试样，其表面空蚀面积的比例小于抛光试样的1/10；激光纹理加工试样的抗空蚀特性的改善与硬度梯度效应、缓冲空泡运动和限域作用等效应相关。
关键字: 钛合金；表面纹理；空蚀；激光加工
（Department of Mechanical Engineering, Dalian Maritime University, Dalian 116026, China）
Abstract:Ti6Al4V alloy was treated by laser surface modification method. The characterization of surface properties of Ti6Al4V specimens was conducted with surface profiler, contact angle measurer and X-ray diffractometer. The cavitation erosion resistances of Ti6Al4V specimens were measured by ultrasonic vibrator. The cavitation erosion topographies of Ti6Al4V alloy specimens were analyzed by scanning electron microscopy and optical microscopy. The results indicate that the hardness of specimens increases from 337HV to 550HV after modified by laser texture manufacturing. The water contact angles of the specimens are increased by 10˚. The cavitation erosion resistances of all specimens by laser texture manufacturing were improved, especially for the grid texture specimens with small space. The area percent of cavitation erosion of the above specimens is less than one tenth of that of the polished Ti6Al4V specimens. The enhancement of cavitation erosion resistances of laser texture manufacturing specimens is related to the hardness gradient effect, cushion of bubble motion and limited area action.
Key words: titanium alloy; surface texture; cavitation erosion; laser manufacturing
