(大連海事大學(xué) 機(jī)械工程系，大連 116026)
摘 要: 采用激光表面改性的方法對Ti6Al4V合金進(jìn)行紋理加工。采用表面粗糙度測試儀、接觸角測量儀和X射線衍射儀對激光紋理加工試樣的表面特性進(jìn)行表征，采用磁致伸縮超聲振動儀對試樣的抗空蝕特性進(jìn)行測試，采用光學(xué)顯微鏡和掃描電子顯微鏡對試樣空蝕前、后的表面形貌進(jìn)行觀測。結(jié)果表明：經(jīng)激光表面紋理加工，試樣的硬度由337HV提高到550HV，水接觸角增大10˚；激光紋理加工試樣的抗空蝕特性有所改善，特別是對于具有較小間距網(wǎng)格形狀的表面紋理試樣，其表面空蝕面積的比例小于拋光試樣的1/10；激光紋理加工試樣的抗空蝕特性的改善與硬度梯度效應(yīng)、緩沖空泡運(yùn)動和限域作用等效應(yīng)相關(guān)。
關(guān)鍵字: 鈦合金；表面紋理；空蝕；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
