面扫描激光淬火对钛合金微动磨损性能的影响

The Effect of Band Laser Beam Quenching on Fretting Wear Characteristics of Titanium Alloy

用ＳＲＶ摩擦磨损试验机研究了面扫描激光淬火钛合金在线接触条件下的微动磨损性能，并用ＳＥＭ、ＥＤＡＸ及Ｘ射线衍射等分析了其机理．结果表明：激光淬火处理后钛合金的耐磨性提高１２３倍，摩擦系数降至原来的１／３～１／５，微观硬度提高２．８倍；抗蚀能力得到改善．同时，激光淬火处理后钛合金表面晶粒细化为球状微晶结构，由表面向内层形成多层梯度结构，分别为３μｍ陶瓷化层，５～６μｍ无序结构层，由α＋β相组成的１．５～２．０ｍｍ淬火区．

The fretting wear characteristics of titanium alloy before and after band laser beam quenching(BLBQ)were investigated on SRV friction and wear tester. The mechanisms of the improvement of tribological properties were studied by means of SEM, EDAX, XRD and metallography techniques. Compared with the specimen before BLBQ, the fretting wear resistance of titanium alloy after BLBQ increased by a factor of 123,the friction coefficient decreased and the micro hardness increased remarkably,and the corrosion resistance was also improved.Moreover,the crystals of titanium alloy were refined into ball like micro structure, the multi layer structures were obtained. That is,about 3 μm cermet layer formed on the sub surface,then the amorphous layer of 5￣6 μm thick and finally quenching zone about 1.5￣2.0 mm thick which was made up of α+β phases.