CAJ | 학술논문

为提高钛合金的抗空蚀性能,采用激光对Ti6Al4V合金进行表面纹理加工.采用维氏显微硬度计对试样的横截面硬度进行表征,采用磁致伸缩超声振动仪对试样的抗空蚀特性进行测试,采用扫描电子显微镜对试样空蚀形貌进行观测.结果表明,经激光表面纹理加工后,试样的表层硬度均得到明显提高.直线纹理试样空蚀的形貌特征为纹理突起处呈海绵状,网格纹理试样空蚀的形貌特征为纹理突起处出现针孔和疲劳裂纹及由脆性断裂引起材料剥离脱落产生的空蚀坑,状点纹理试样表面仅出现麻点状空蚀特征.各种纹理的凹陷处均无明显的空蚀特征,抗空蚀性能均得到明显增强.
위제고태합금적항공식성능,채용격광대Ti6Al4V합금진행표면문리가공.채용유씨현미경도계대시양적횡절면경도진행표정,채용자치신축초성진동의대시양적항공식특성진행측시,채용소묘전자현미경대시양공식형모진행관측.결과표명,경격광표면문리가공후,시양적표층경도균득도명현제고.직선문리시양공식적형모특정위문리돌기처정해면상,망격문리시양공식적형모특정위문리돌기처출현침공화피로렬문급유취성단렬인기재료박리탈락산생적공식갱,상점문리시양표면부출현마점상공식특정.각충문리적요함처균무명현적공식특정,항공식성능균득도명현증강.
Laser-modified surface texture on Ti6Al4V alloy was investigated to improve its cavitation erosion resistance. The characterization of hardness in cross section of Ti6Al4V speci-mens was conducted by Vickers hardness, cavitation erosion characteristics were measured by ultrasonic vibrator, and cavita-tion erosion topographies were analyzed by scanning electron mi-croscopy. Results indicate that the hardness of the surface and subsurface layers increases after being modified by laser texture manufacturing. The topographical characteristic of the line tex-ture specimens is that the protuberant places appear to be sponge. The topographical characteristic of the grid texture specimens is that there are many pinholes, fatigue cracks and cavitation pits caused by brittle material removing from the pro-tuberant places. The topographical characteristic of dot texture specimens is that only some pockmarks appear on the protuber-ant places. No obvious cavitation erosion characteristics appear at cupped place in all kinds of textures. Cavitation erosion resis-tances of Ti6AI4V specimens are significantly enhanced by laser texture manufacturing.