激光冲击强化对K417材料振动疲劳性能的影响  

Effects of Laser Shock Processing on Vibration Fatigue Properties of K417 Material

作　　者：李伟[1] 何卫锋[1] 李应红[1] 汪诚[1] 杨卓君[1] 

机构地区：[1]空军工程大学工程学院,陕西西安710038

出　　处：《中国激光》2009年第8期2197-2201,共5页Chinese Journal of Lasers

基　　金：国防预研基金(5132701)资助项目

摘　　要：为研究激光冲击强化(LSP)对镍基高温合金振动疲劳强度的影响,使用流水约束层和铝箔涂层,利用波长为532 nm,脉宽为10 ns,能量为1.5 J,冲击光斑尺寸为1.6 mm的YAG激光器对K417试件进行了激光冲击强化处理。使用升降法测试比较了冲击处理试件和未处理试件的振动疲劳强度。结果表明,试件经激光冲击强化后振动疲劳强度由106.5 MPa提高到285.5 MPa,疲劳性能大大提高。对激光冲击强化后的试件断口分析结果表明激光冲击的强化作用抑制了裂纹在试件表层的萌生和扩展,从而提高了材料的振动疲劳强度。In order to study the effects of laser shock processing （LSP） on the vibration fatigue strength of nickel- based superalloy, water and aluminum foil were used for confining medium and ablation medium. K417 specimens were processed with YAG laser. With the wavelength of 532 rim, pulse duration of 10 ns, and output energy of 1.5 J. The laser was focused on a spot ofΦ 1.6 mm. The effects of laser shock processing on the vibration fatigue strength of K417 are investigated using up-down method. The experimental results show that laser shock processing can increase K417＇s vibration fatigue strength from 106.5 MPa to 285.5 MPa. Fracture analysis results show that laser shock processing strengthens the metal surface and suppresses the crack＇s initiation and expansion. So the K417＇s fatigue performance is improved.

关 键 词：激光技术 激光冲击强化 表面处理 镍基高温合金 振动疲劳 冲击波 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] V216.3[航空宇航科学与技术—航空宇航推进理论与工程]