电磁冲击对TC11钛合金叶片疲劳性能的影响  

Effect of electromagnetic shock on fatigue performance of TC11 titanium alloy blade

作　　者：孙倩 孙向阳 宋燕利[3] 钱东升[4] 华林[3] 王自成 邱冬生 SUN Qian;SUN Xiang-yang;SONG Yan-li;QIAN Dong-sheng;HUA Lin;WANG Zi-cheng;QIU Dong-sheng(Hubei Key Laboratory of Advanced Technology for Automotive Components,School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Collaborative Innovation Center for Automotive Components Technology,School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Engineering Technology Research Center for New Energy and Intelligent Connected Vehicle,School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;Wuhan Jingtai Technology Co.,Ltd.,Wuhan 430056,China)

机构地区：[1]武汉理工大学汽车工程学院,现代汽车零部件技术湖北省重点实验室,武汉430070 [2]武汉理工大学汽车工程学院,汽车零部件技术湖北省协同创新中心,武汉430070 [3]武汉理工大学汽车工程学院,湖北省新能源与智能网联车工程技术研究中心,武汉430070 [4]武汉理工大学材料科学与工程学院,武汉430070 [5]武汉晶泰科技股份有限公司,武汉430056

出　　处：《中国有色金属学报》2023年第3期752-766,共15页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2020YFA0714900);国家自然科学基金资助项目(51975441,51805393)。

摘　　要：本文研究了电磁冲击作用对TC11钛合金叶片振动疲劳极限的影响,对电磁冲击前后钛合金叶片进行了残余应力测试和显微硬度测试,利用光学显微镜(OM)和扫描电子显微镜(SEM)对叶片材料显微组织进行了表征,并结合有限元分析,探讨了电磁冲击对TC11钛合金叶片疲劳性能影响机理。结果表明,当电流密度为270 A/mm^(2)时,经电磁冲击处理后叶片振动疲劳极限提升幅度约为36.6%,同时叶片失效裂纹深度及位置发生改变。电磁冲击处理过程中叶片整体温升极小,电极与试样接触处最大瞬时温度仅约60℃。叶片显微组织未见明显变化,叶片表层残余压应力及叶片内部平均显微硬度随电流密度的增大而增大,叶片内部显微硬度分布发生改变。分析认为,电磁脉冲能量能够对叶片材料产生微振动效应,调整叶片整体残余应力分布,修复微观损伤缺陷,达到提升叶片疲劳性能的目的。In this paper,the influence of electromagnetic shocking treatment(EST)on vibration fatigue limit of TC11 titanium alloy blade was studied.The residual stress and microhardness of titanium alloy blade before and after EST were tested.And the microstructure of blade material was characterized by optical microscope and scanning electron microscope.Combined with finite element simulation analysis,the influence mechanism of EST on the fatigue performance of TC11 titanium alloy blade were explored and discussed.The results show that,the vibration fatigue limit of TC11 titanium alloy blade is improved by EST.Especially,the fatigue limit of the TC11 titanium alloy blade increases by 36.6%when the current density is 270 A/mm^(2).Meanwhile,the crack depths of the blades after fatigue failure reduce and the positions of these cracks change.During EST,the overall temperature rise of the blade is very small,and the maximum instantaneous temperature on the surface of the blade is only about 60℃at one end with the electrode,which is caused by contact resistance.Thus,no obvious changes for the OM and SEM morphology of TC11 titanium alloy blade material after EST are observed compared with those of the control group.While,the residual stress on the surface layer and the average microhardness inside the blade increase with the increase of current density,as well as the microhardness distribution inside the blade also changes.The electromagnetic pulse energy can cause micro vibration effect on the blade material.According to the analysis,the microstructure of the blade material will be excited nonlinearly by electromagnetic pulse,which will adjust the overall residual stress distribution of the blades,repair the micro damage and defects,and then improve the fatigue performance of the blades.

关 键 词：电磁冲击 钛合金叶片 疲劳性能 残余应力 损伤 缺陷 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程]