激光抛光TC4钛合金高粗糙度表面及表面耐磨损行为  

Laser polishing of TC4 titanium alloy high roughness surface and surface wear resistance behavior

作　　者：戴峰泽[1] 安春桥 霍坤 何娟 陈希章[2] DAI Fengze;AN Chunqiao;HUO Kun;HE Juan;CHEN Xizhang(School of Mechanical Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;College of Mechanical and Electrical Engineering,Wenzhou University Wenzhou,Zhejiang 325035,China)

机构地区：[1]江苏大学机械工程学院,江苏镇江212013 [2]温州大学机电工程学院,浙江温州325035

出　　处：《排灌机械工程学报》2025年第3期291-298,共8页Journal of Drainage and Irrigation Machinery Engineering

基　　金：浙江省重点研发计划项目(2021C04022)。

摘　　要：针对离心泵薄壁钛合金叶轮叶片表面粗糙度控制困难以及在使用过程中砂石对叶片表面的磨损问题,分别在氩气和空气氛围下采用纳秒脉冲激光器对铣削后具有高粗糙度的TC4钛合金表面进行抛光,发现在氩气氛围下能获得更好的抛光效果,能使工件表面算术平均高度下降56.12%、表面硬度提高21.94%;而在空气环境下,工件表面获得了高硬度的氮化钛,表面算术平均高度下降了51.89%,硬度比原始表面提高了176.79%.摩擦磨损试验结果表明:原始的工件表面和氩气氛围下抛光的工件表面均以磨粒磨损为主,其中在氩气氛围下抛光的工件由于抛光过程中获得了硬度较高的α′-Ti马氏体,因此表面的磨痕宽度更窄;而在空气氛围下则由于重熔层获得了高硬度氮化钛使得工件表面平均动摩擦系数从0.46降至0.16,显著提高了工件表面的耐磨性,磨痕宽度大幅降低,在与GCr15陶瓷球对磨过程中工件表面则主要表现为黏着磨损.Aiming at the difficulty of controlling the surface roughness of thin-walled titanium alloy impeller blade of centrifugal pump and the abrasion of the blade surface by gravel in the process of use,the TC4 titanium alloy surface with high roughness after milling was polished by using a nanosecond pulse laser under argon and air atmospheres,respectively.It is found that a better polishing effect could be obtained under argon atmosphere,which can reduce the surface roughness of the workpiece by 56.12%and the surface hardness increases by 21.94%.In the air atmosphere,high hardness of titanium nitride is obtained on the workpiece surface,and the surface roughness decreases by 51.89%and the hardness increases by 176.79%when compared with the original surface.The frictional wear test results show that both the original surface of the workpiece and the surface of the workpiece polished under argon atmosphere are mainly dominated by abrasive wear.Among them,the workpiece polished under argon atmosphere has a narrower width of abrasion marks due to the higher hardnessα′-Ti martensite is obtained during the polishing process.Under air atmosphere,due to the high hardness titanium nitride obtained from the remelting layer.the average dynamic friction coefficient of the workpiece surface decreases from 0.46 to 0.16.This significantly improves the wear resistance of the workpiece surface and reduces the width of the abrasion marks.During the grinding process with GCr15 ceramic balls,the workpiece surface mainly exhibits adhesive wear.

关 键 词：TC4钛合金 激光抛光 激光氮化 硬度 摩擦磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]