金属板料激光冲击成形及其破裂行为研究  

Study on Laser Shock Forming and Fracture Behavior of Metal Sheet

作　　者：张青来[1] 王荣[1] 洪妍鑫 吴铁丹 钱阳[1] 张永康[2] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]东南大学机械工程学院,江苏南京210096

出　　处：《中国激光》2014年第4期115-120,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(51175231)

摘　　要：采用最大输出激光脉冲能量为12.5J的Thales Laser激光器,对比交叉轧制AZ31镁合金薄板和交叉冷轧钼带的激光冲击成形(LSF)特征,对其破裂行为和微观结构进行分析和探讨。结果表明:采用不同能量密度的激光束对镁合金薄板和钼带两种不同材料进行连续多次激光冲击,实现了其高应变速率冷成形。AZ31薄板和钼带LSF破裂均表现出厚度减薄形式,而钼带LSF过程中发现层裂现象,AZ31薄板LSF试样断口由韧性断裂和脆性断裂混合组成,而钼带LSF试样属于脆性断裂。此外,还讨论了两种金属板料的各向异性和应变速率对高能高应变速率LSF成形性能及其破裂行为的影响。The cross-rolled AZ31 sheet and the cold-rolled molybdenum strip are shocked by the Thales Laser with the maximum output pulse energy of 12.5 J. Properties of these two laser shock forming （LSF） are compared and then fracture behavior and microstructure are analyzed and discussed. The results show that cold forming of AZ31 sheet and molybdenum strip with high strain rate is realized after continuously repeat laser shock under different energy densities. The LSF fracture behavior of AZ31 sheet and molybdenum strip both perform thickness thinning while a spallation phenomenon is observed during LSF of molybdenum strip. The fracture of AZ31 sheet is a mixture of ductile and brittle fracture, while that of molybdenum strip is the brittle fracture. In addition, the effect of these two metal sheet anisotropy and strain rate on the LSF formability with high energy, high strain rate and fracture behavior is discussed.

关 键 词：AZ31薄板 钼带 激光冲击成形 破裂方式 微观结构 

分 类 号：TN249[电子电信—物理电子学]