超声冲击强化工艺对钛合金表面质量及磨损性能影响研究  

Research on the Effect of Ultrasonic Impact Strengthening on the Surface Property and Wear Properties of Titanium Alloy

作　　者：董宝昆 张宇航 行登海 隋天一 闫帅[1] 林彬[1] Dong Baokun;Zhang Yuhang;Xing Denghai;Sui Tianyi;Yan Shuai;Lin Bin(Tianjin University,Tianjin 300350,China;China Ship Development and Design Center,Wuhan 430000,China;AVIC Xi’an Flight Automatic Control Research Institute,Xi’an 710076,China)

机构地区：[1]天津大学,天津300350 [2]中国舰船研究设计中心,湖北武汉430000 [3]航空工业西安飞行自动控制研究所,陕西西安710076

出　　处：《航空科学技术》2023年第12期43-58,共16页Aeronautical Science & Technology

基　　金：航空科学基金(20180748004)。

摘　　要：钛合金较差的耐磨性严重限制了其在航空航天领域的应用。为了研究Ti-6Al-4V(TC4)钛合金在超声冲击强化后耐磨性提高的机理,通过Ti-6Al-4V(TC4)钛合金超声冲击强化试验,探究超声冲击处理的工艺参数(刀具直径、气浮台压力、冲击道次、刀头形状、进给步距)对钛合金表面质量及性能的影响规律及敏感性,发现当采用球头刀具、气浮台压力为0.45MPa、进给步距为0.3mm时,超声冲击强化对钛合金耐磨性的提高最明显。通过对摩擦学试验中摩擦系数、球磨斑直径、盘磨损率、表面形貌图等试验结果的研究分析发现,经过超声冲击强化处理后钛合金材料的耐磨性能提高是压应力抑制裂纹机制、表面硬化强化机制和沟壑储油机制共同作用的结果,验证了超声冲击处理对钛合金耐磨性的实际强化效果。The poor wear resistance of titanium alloys severely limits their application in the aerospace field.In order to study the mechanism of improving wear resistance of Ti-6Al-4V(TC4)titanium alloy after ultrasonic impact strengthening,ultrasonic impact strengthening test of Ti-6Al-4V(TC4)titanium alloy was conducted.The influence rule and sensitivity of ultrasonic impact treatment process parameters(tool diameter,air float table pressure,impact pass,tool head shape,feed step)on the surface quality and performance of titanium alloy were investigated.It was found that when the ball head tool was used,the pressure of air float table was 0.45MPa,and the feed step was 0.3mm,the ultrasonic impact strengthening had the most obvious improvement on the wear resistance of titanium alloy.Through the study and analysis of the tribological test results such as friction coefficient,ball grinding spot diameter,disk wear rate and surface topography,it is found that the wear resistance of titanium alloy after ultrasonic impact strengthening treatment is improved by the joint action of compressive stress suppression crack mechanism,surface hardening strengthening mechanism and gully oil storage mechanism.The actual enhancement effect of ultrasonic impact treatment on the wear resistance of titanium alloy was verified.

关 键 词：超声冲击处理 钛合金 表面组织特性 摩擦学特性 

分 类 号：V252[一般工业技术—材料科学与工程]