不同摩擦副材料对TC4合金摩擦磨损性能的影响

利用TRB³摩擦试验机采用球/平面接触形式探究TC4合金摩擦磨损性能,使用TC4合金球、GCr15钢球以及Si₃N₄陶瓷球作为对摩副探究TC4合金在不同法向载荷作用下摩擦划痕和磨损特性;通过3D激光共聚焦显微镜测量摩擦划痕形貌,建立能量磨损模型探究磨损过程中接触状态的变化机制,预测磨损进程。结果表明：随着上试样硬度的逐渐降低,球/平面的接触状态向微平面/平面的接触状态转变,摩擦划痕状态受到钛合金在压头前端位错墙和压头后端黏着颗粒的影响,划痕长度和宽度随载荷的增加线性增长,划痕深度出现“锯齿”状波动;“切削与塑性比”f_cp分布于f_cp=0.5两侧说明压头对TC4合金的损伤以微犁耕和微切削2种机制交互作用,说明划痕表面加工硬化现象对表面的保护作用,划痕硬度和表面粗糙度的关系可以预测材料变形过程中的损伤情况。

Effect of Friction Pair Materials on Friction and Wear Properties of TC4

The friction and wear properties of TC4 alloy surface were investigated by using ball/plane contact form of TRB3 friction testing machine. Using different upper samples which were TC4 ball, GCr15 steel ball and Si3N4 ceramic ball studied the friction scratches and wear characteristics of TC4 alloy under different normal forces. The friction scratch morphology was measured by 3D laser confocal microscope, and the energy wear models which could effectively predict the wear process were established to explore the change mechanism of contact state. The results indicated that the friction scratches of TC4 alloy whose length and width increased linearly with the increase of the load and depth fluctuates like a "sawtooth" were affected by the dislocation wall of indenter front and the adhesion particles of indenter offside, because the contact state of ball/plane changed to micro-plane/plane contact state with the enhance of the hardness of the upper sample. The cutting to plasticity ratio (fcp) which distributed to both sides of fcp =0.5 indicated the damage of TC4 alloy by indenter that were interacted by micro-ploughing and micro-cutting interacting to explain protective effect of process hardening phenomenon on the surface. In the meantime, the linear relationship between scratch hardness and surface roughness could predict the damage during material deformation.