超声波与电火花表面复合强化Ti17合金的疲劳性能(英文)  

Fatigue Properties of Ti17 Alloy Strengthened by Combination of Electric Spark Treatment with Ultrasonic Surface Treatment

作　　者：焦磊[1] 乔生儒[1] 张程煜[1] 马侃[1] 韩栋[1] Dina Gertsriken Vladimir Mazanko 

机构地区：[1]西北工业大学超高温结构复合材料国家重点实验室 [2]Institute for Metal Physics N.A.S.of the Ukraine,Academician Vernadsky Blvd,03680 kyiv-142,Ukraine

出　　处：《稀有金属材料与工程》2010年第12期2091-2094,共4页Rare Metal Materials and Engineering

基　　金：National Natural Science Funds(50702045);The Research Fund for the Doctoral Program of Higher Education(20070699007);Program for New Century Excellent Talents in University

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。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 testing machine at 350 degrees C. 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.

关 键 词：超声波 电火花 表面复合强化 硬质合金 疲劳性能 SURFACE TREATMENT Spark ultrasonic TREATMENT FATIGUE life 疲劳寿命 residual stress 表面残余应力 the SURFACE roughness 表面处理 SURFACE morphology EST SURFACE TREATMENT 高温疲劳试验机 FATIGUE tests 试样 

分 类 号：TG66[金属学及工艺—金属切削加工及机床]