超声滚压对2024铝合金疲劳裂纹扩展行为的影响  

Effect of ultrasonic rolling on fatigue crack propagation behavior of 2024 aluminum alloy

作　　者：王磊 刘小鹏 周松 安金岚 张宏杰 丛家慧 WANG Lei;LIU Xiao-peng;ZHOU Song;AN Jin-lan;ZHANG Hong-jie;CONG Jia-hui(College of Mechanical Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;School of Mechatronics Engineering,Shenyang Aerospace University,Shenyang 110136,China;Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]苏州科技大学机械工程学院,江苏苏州215009 [2]沈阳航空航天大学机电工程学院,沈阳110136 [3]沈阳航空航天大学航空制造工艺数字化国防重点学科实验室,沈阳110136

出　　处：《吉林大学学报(工学版)》2024年第12期3486-3495,共10页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(51775355,52105157);辽宁省百千万人才项目(2020-78-B46)。

摘　　要：对航空航天用2024铝合金在空气和腐蚀环境下的疲劳裂纹扩展行为进行研究,分析对比了超声滚压对疲劳裂纹扩展行为的影响。结果表明:超声滚压处理使材料表层晶粒细化形成60~70μm厚的塑性变形层,显微硬度相对于母材提升了45%,且由材料表面向内部呈梯度下降。超声滚压处理降低了裂纹扩展的初始速率,提升了裂纹扩展速率的增长率;超声滚压对两种环境下的疲劳性能都有显著的提升,但在空气环境下对疲劳性能的提升更为显著,这是由于腐蚀环境提升了裂纹扩展的初始裂纹扩展速率,降低了裂纹扩展速率的增长率。The fatigue crack propagation behavior of 2024 aluminum alloy used in aerospace was studied under air and corrosion environment,and the effect of ultrasonic rolling on the fatigue crack propagation behavior was analyzed and compared.The results show that the surface grain of the material is refined by ultrasonic rolling treatment to form a plastic deformation layer with a thickness of 60-70μm,and the microhardness is increased by 45%compared with the base metal,and the gradient decreases from the surface to the interior of the material.The initial rate of fatigue crack growth was decreased and the growth rate of fatigue crack growth was increased by ultrasonic rolling treatment.Ultrasonic rolling can significantly improve the fatigue performance in both environments,but the improvement is more significant in the air environment,because the saline environment increases the initial crack growth rate and reduces the growth rate of crack growth rate.

关 键 词：机械工程 2024铝合金 超声滚压 裂纹扩展 

分 类 号：TG146[一般工业技术—材料科学与工程]