超声波滚压强化对304不锈钢表面质量的影响  

Effect of ultrasonic rolling strengthening on surface quality of 304 stainless steel

作　　者：刘子放 苑泽伟[1] 朱磊 潘高峰 吴天正 唐爱玲 LIU Zifang;YUAN Zewei;ZHU Lei;PAN Gaofeng;WU Tianzheng;TANG Ailing(School of Mechanical Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学机械工程学院,沈阳110870

出　　处：《现代制造工程》2023年第11期86-93,共8页Modern Manufacturing Engineering

基　　金：国家自然科学基金项目(52275455)。

摘　　要：不锈钢关节轴承是航空领域应用最广泛的关节轴承之一。但是由于航空关节轴承转速较慢,不利于形成动压润滑,极易造成磨损,因此,设计了一种圆锥形和阶梯形复合型变幅杆,并搭建试验装置对304不锈钢进行超声波滚压强化试验。通过对比试验,探究了滚压次数和不同预处理方式对材料表面质量的影响。试验结果表明:滚压3次后,表面粗糙度Ra值达到0.08μm,达到了最佳效果;滚压第4次表面显微硬度为最佳,达到473.0HV,提高了近40%;效果较好的预处理在一定程度上可以给滚压后的试件表面带来质量提升;通过X射线探伤,在材料内部并未发现硬化分层缺陷,有效提高了材料的使用寿命,可以为航空关节轴承的表面强化工艺提供参考。Stainless steel joint bearing is one of the most widely used joint bearings in the aviation field.However,due to the slow speed of the aviation joint bearing,it is not conducive to form dynamic pressure lubrication,which is very easy to cause wear.Therefore,a cone and step composite horn was designed and a test device was built to carry out ultrasonic rolling strengthening test for 304 stainless steel.The effects of rolling times and different pretreatment methods on the surface quality of the material were investigated through comparative experiments.The results of the experiments show that the surface roughness Ra reaches 0.08μm after three times of rolling,which achieve the best results;the surface micro hardness of the fourth rolling is the best,reaching 473.0HV,increased by almost 40%;pretreatment with good effect can improve the quality of the rolled specimen surface to a certain extent;through X-ray flaw detection,no hardening delamination defect was found inside the material,which effectively improves the service life of the material,and can provide reference for the surface strengthening process of aviation joint bearings.

关 键 词：超声波滚压 不锈钢 表面粗糙度 表面显微硬度 内部缺陷 预处理 

分 类 号：TH162[机械工程—机械制造及自动化]