7050-T7451铝合金的超声振动辅助孔挤压强化  

Ultrasonic vibration assisted hole expansion strengthening of 7050-T7451 aluminum alloy

作　　者：凡志磊 刘飞 苏宏华[2] 徐九华[2] 葛恩德 周恩涛 FAN Zhi-lei;LIU Fei;SU Hong-hua;XU Jiu-hua;GE En-de;ZHOU En-tao(COMAC Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 200436,China;College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]中国商飞上海飞机制造有限公司,上海200436 [2]南京航空航天大学机电学院,江苏南京210016

出　　处：《塑性工程学报》2023年第10期52-59,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金创新研究群体(51921003);江苏省科研与实践创新计划项目(KYCX21_0196);国家商用飞机制造工程技术研究中心创新基金资助项目(COMAC-SFGS-607)。

摘　　要：为了探究超声振动辅助孔挤压强化工艺对7050铝合金疲劳性能的影响,开展了有无超声振动辅助孔挤压强化试验,对比分析了超声振动对挤压力、孔径、金属堆积、表面粗糙度与表面形貌、残余应力和疲劳寿命的影响。结果表明,超声振动辅助孔挤压强化后,试样孔壁表面粗糙度降低了67.86%,其孔壁表面粗糙度降低程度大于孔挤压强化;超声振动辅助孔挤压强化试样孔壁挤入端和挤出端的轴向挤压力小于孔挤压强化,减小了孔壁材料的轴向流动,增加了孔壁材料的径向塑性变形;超声振动辅助孔挤压强化试样和孔挤压强化试样的平均疲劳寿命分别是未挤压强化试样的1.5和1.2倍,超声振动辅助孔挤压强化试样的平均疲劳条纹宽度小于孔挤压强化试样和未挤压强化试样。To explore the influence of ultrasonic vibration assisted hole expansion strengthening process on the fatigue property of 7050 aluminum alloy,the hole expansion strengthening experiments with or without ultrasonic vibration assisted were carried out,and the effects of ultrasonic vibration on the expansion force,hole diameter,metal accumulation,surface roughness and surface morphology,residual stress and fatigue life were compared and analyzed.The results show that after ultrasonic vibration assisted hole expansion strengthening,the surface roughness of specimen hole wall decreases by 67.86%,and the reduction degree of surface roughness of hole wall for it is greater than that of hole expansion strengthening.The axial expansion force at the inlet and extrusion ends of ultrasonic vibration assisted hole expansion strengthening is smaller than that of hole expansion strengthening,which reduces the axial flow of hole wall material and increases the radial plastic deformation of hole wall material.The average fatigue life of ultrasonic vibration assisted hole extrusion strengthened specimen and hole extrusion strengthened specimen is 1.5 and 1.2 times of specimen without expansion strengthening,respectively.The average fatigue striation width of ultrasonic vibration assisted hole expansion strengthening specimen is smaller than that of hole expansion strengthening and that of specimen without expansion strengthening.

关 键 词：7050铝合金 超声振动 孔挤压强化 挤压芯棒 

分 类 号：TG376.3[金属学及工艺—金属压力加工]