全文下载:2013020182
李旭东,王玉刚,苏维国,丁文勇
(海军航空工程学院 青岛校区, 山东 青岛 266041)
摘要: 腐蚀疲劳是一种在机械应力和腐蚀介质联合作用下的材料退化行为。这种材料退化对于航空工业是一个严峻的问题。因此利用扫描电镜原位技术对于预腐蚀LY12CZ铝合金进行了实验研究。实验结果表明腐蚀损伤对于铝合金疲劳裂纹扩展行为具有强烈的影响,这种影响可以用腐蚀坑深度来表征。并提出了一种评价铝合金腐蚀疲劳裂纹行为的方法。
关键词: 疲劳裂纹; 铝合金; 预腐蚀; 微结构; SEM原位技术
中图分类号: TG171;V252文献标志码: A
Research on Fatigue Cracking Behavior of LY12CZ Aluminum Alloy with Corrosion Damage
LI Xu-dong, WANG Yu-gang, SU Wei-guo, DING Wen-yong
(QingdaoCampus of Naval Aeronautical Academy,Qingdao266041,China)
Abstract: Corrosion fatigue is a form of degradation subjected to combined damage of mechanical stress and corrosive medium, which is a severe issue in aircraft industry. Experimental investigations on prior corrosion fatigue cracking behavior of LY12CZ were conducted with scanning electron microscope (SEM). Results indicate corrosion damage is important for the fatigue cracking behavior of LY12CZ aluminum alloy. The effect of corrosion pit on fatigue crack can be characterized by the depth of corrosion pit. A method to evaluate corrosion fatigue crack growth for AA LY12CZ is proposed.
Key words: fatigue crack;aluminum alloy;pre-corrosion;microstructure;SEM in-situ technology
收稿日期:2012-04-10
作者简介: 李旭东(1984—),男,讲师.