张青来
,
段钧剑
,
钱阳
,
王荣
,
匡雁锐
,
张永康
稀有金属材料与工程
采用最大输出激光脉冲能量为12.5 J的Thales Laser激光器对AZ31镁合金交叉轧制薄板进行激光冲击成形(LSF),在此基础上研究和分析了激光冲击表面结构和电化学特性.结果表明:LSF属于厚度减薄机制,失效形式具有韧性断裂和脆性断裂混合特征;LSF内凹面出现了纹理清晰的周期性波纹结构,波纹间距为纳米级,伴随着激光冲击强化效应和微观结构改变,镁合金耐腐蚀性得到提高.
关键词:
AZ31镁合金
,
激光冲击成形
,
微观结构
,
残余应力
,
电化学腐蚀
张青来
,
洪妍鑫
,
王荣
,
李兴成
,
段钧剑
,
张永康
材料研究学报
采用最大输出能量为12.5 J的Nd-YAG激光器对AZ31镁合金薄板进行激光冲击成形(LSF),用高分辨率透射电镜分析和研究了试样冲击区表面状态和微观结构.结果表明:在镁合金薄板LSF冲击区凹面出现了纹理清晰的周期性波纹结构,波纹间距为纳米级,在LSF过程中伴随着亚晶、纳米晶和形变孪晶的产生.分析了冲击凹面残余应力分布,并探讨了LSF过程中镁合金形成表面波纹现象和纳米晶形成的原因.
关键词:
金属材料
,
AZ31镁合金
,
激光冲击成形
,
表面波纹
,
纳米结构
,
残余应力
金属学报(英文版)
Abstract: Laser shock forming (LSF) is a new technique realized by applying an impulsive pressure generated by laser-induced shock wave on the surface of sheet metal. LSF of sheet metal is investigated with experiment and numerical simulation in this paper, the basic theories are introduced, the surface quality and deformation of the processed Titanium sample (TA2) are examined; ABAQUS is used to simulate laser shock forming and the central displacement of the shocked region is measured and compared with the simulation. Overlapped LSF treatment is experimentally carried out to produce groove and simulated. The results show the surface quality and the microstructure with single laser pulse have no remarkable change and ablation is observed on the surface of the sample with overlapped pulses. The deformation of the simulation agrees with the experiment quite well.
关键词:
Laser shock forming
,
数字仿真
,
表面质量
,
变形
