微动幅值对Ti-6Al-4V合金摩擦特性的影响  

Effect of Fretting Amplitude on Friction Properties of Ti-6Al-4V Alloy

作　　者：郭薇[1] 李健[2] 黄淑梅[1] 王运锋[1] 何蕾[1] Guo Wei Li Jian Huang Shumei Wang Yunfeng He Lei(Northwest Institute for Nonferrous Metal Research, Xi＇an 710016, China Northwestern Polytechnical University, Xi＇ an 710072, China)

机构地区：[1]西北有色金属研究院,陕西西安710016 [2]西北工业大学,陕西西安710072

出　　处：《钛工业进展》2016年第5期16-20,共5页Titanium Industry Progress

基　　金：国家自然科学基金项目(51275410)

摘　　要：钛合金的微动磨损会加速裂纹萌生及扩展,甚至导致构件提前失效。为了在有限元建模过程中提供更加准确地反映钛合金摩擦特性的数据,更好地模拟微动磨损行为,对微动幅值为10~300μm时,球/平面接触Ti-6Al-4V合金的微动摩擦特性进行了研究,测量了不同微动幅值下的摩擦系数,对微动斑中心区域的表面形貌进行了表征,并对接触界面不同深度处的化学成分进行了检测。结果表明,微动幅值为100μm时摩擦系数最大,不同微动幅值下,摩擦系数的演变不一致,且摩擦系数的演变与微动模式有关;微动幅值的不同会导致表面形貌的差异,随着微动幅值的增大,磨屑颗粒逐渐减小,同时形状从块状逐渐向球形转变;此外,当微动幅值较大时,钛合金表面氧化严重,并伴随有氮化物的形成。Fretting wear can accelerate the crack initiation and propagation of titanium alloy, and even lead to the failure of components. In order to reflect the friction characteristics of titanium alloy in the finite element modeling process more accurately, and to simulate the fretting wear behavior better, an experimental investigation was conducted to determine the effect of displacement amplitude on fretting tribological behavior of Ti-6Al-4V alloy with flat/ball configuration, and the reciprocating amplitudes were varied between 10 μm and 300 μm. The fretting coefficients of friction （COF） were obtained, the fretting scars and surface morphologies were characterized, and the chemical compositions at different depths of the contact interface were also investigated. The resuks show that the maximum of COF appears at 100 μm and evolutions of friction coefficient are not consistent under various fretting amplitudes. The evolution of COF is related to fretting modes. Fretting amplitude will also lead to the differences in surface morphology, with the increasing of fretting amplitude, the grinding particles decrease gradually, and the shape also gradually changes from bulk to spherical. In addition, when fretting amplitude is large, the surface of titanium alloy oxidizes seriously, accompanied by the formation of nitride.

关 键 词：TI-6AL-4V合金 微动磨损 微动摩擦系数 微动幅值 表面粗糙度 

分 类 号：V252.2[一般工业技术—材料科学与工程]