摘要：将Ti17合金经过电火花处理(EST)后再进行超声波表面处理以期提高疲劳寿命.通过扫描电子显微镜观察表面形貌及强化层结构,经X射线衍射分析表面残余应力,采用HT-100高温疲劳试验机测试350℃拉-拉疲劳寿命.结果表明,经过超声波表面处理后,试样表面粗糙度及表面残余应力降低,复合强化后试样的疲劳寿命是仅经过EST处理的两倍.经过硬质合金YG8电极EST以及超声波复合处理的试样疲劳寿命最长. Abstract： The surfaces of Ti17 alloy were strengthened by an electric spark treatment (EST), then an ultrasonic surface treatment was used in order to improve the fatigue life. The surface morphology was observed by SEM. The surface residual stress was analyzed by a X-ray diffractometer. Tension-tension fatigue tests were carried out in a HT-100 fatigue testingmachine at 350℃. The results show that the surface roughness and the residual stress are reduced for the specimens after the ultrasonic treatment. The fatigue life of the specimens strengthened by ultrasonic treatments is about twice that of the specimens treated by EST only. The fatigue life of the specimen strengthened by YG8 electrode EST combination with ultrasonic treatment is the longest.

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