电火花表面强化与喷丸复合处理对Ti811合金高温微动疲劳性能的影响  

Effects of Electrospark Surface Strengthening and Shot Peening on Fretting Fatigue of Ti811 Alloy at Elevated Temperature

作　　者：张晓化[1] 刘道新[1] 

机构地区：[1]西北工业大学腐蚀与防护研究室,西安710072

出　　处：《材料工程》2006年第9期31-35,41,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50171054;50371060);航空科学基金资助项目(01H53066)

摘　　要：研究了Ti811钛合金表面电火花强化层的界面成分分布、耐磨和微动疲劳性能。研究结果表明:以0Cr18Ni9合金为电极材料在Ti811钛合金表面进行电火花处理可以形成合金层,显著提高了钛合金表面硬度和耐磨性能。但由于合金层硬度高,韧性较低,在微动疲劳(FF)过程中易萌生裂纹并快速扩展进入基体,致使高温下钛合金FF抗力降低。对电火花强化层进行喷丸强化(SP)后处理能够使钛合金FF抗力恢复到裸件的水平。The constituent distribution, the wear resistance and fretting fatigue resistance （FFR） of electrospark strengthening layer on Ti811 titanium alloy were investigated. The results indicate that alloying layer could be produced by electrospark surface strengthening （ESS） on Ti811 titanium alloy with 0Cr18Ni9 electrode. Thus the hardness and wear resistance of Ti811 alloy are increased remarkably. But the hardness of 0Cr18Ni9 alloying layer is high with low ductility, so cracks easily initiate and extend into the bulk material quickly in the process of fretting fatigue （FF）. Therefore the FFR of the titanium alloy treated by ESS is lower than that of the untreated specimen at elevated temperature. Shot peening （SP） can improve the FFR of the titanium alloy treated by ESS to the level of untreated specimen.

关 键 词：钛合金 微动疲劳 高温 电火花表面强化 喷丸强化 

分 类 号：TG115[金属学及工艺—物理冶金]