激光冲击处理对LY2航空铝合金低循环疲劳寿命影响研究  

Influence research on the low cycle fatigue life transformation of LY2 aerial aluminum by laser shock processing

作　　者：马壮[1] 李应红[1] 汪诚[1] 张永康[2] 

机构地区：[1]空军工程大学工程学院,陕西西安710038 [2]江苏大学机械学院,江苏镇江212013

出　　处：《材料热处理学报》2007年第B08期46-48,57,共4页Transactions of Materials and Heat Treatment

基　　金：国防预研基金(513270103)

摘　　要：本文针对LY2航空铝合金材料,利用爆轰波理论、材料的屈服强度理论计算了激光冲击的参数范围。在此基础上设计进行了试件激光冲击处理前后的低循环疲劳寿命实验,得出激光冲击强化可以显著提高LY2航空铝合金试件的低循环疲劳寿命的结果。最后从残余应力和微观组织结构变化两方面分析了LY2航空铝合金这种低循环疲劳性能改善的根本原因。The research was made on the low cycle fatigue life of LY2 by laser shock processing. According to the detonation wave theory and the yield strength theory, the shock parameters were calculated. Based on this, the low cycle fatigue life experiment was done and it was concluded that the laser shock processing can greatly improve the low cycle fatigue life of LY2. At last, the mechanism of the improvement on the low cycle fatigue life of LY2 was due to two reasons： the residual compressive stress and crystal grain refinement.

关 键 词：激光冲击处理 航空铝合金 低循环 疲劳寿命 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TN249[电子电信—物理电子学]