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.
出处
《中国激光》
EI
CAS
CSCD
北大核心
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
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
laser technique
laser shock processing
surface treatment
nickel-based superalloy
vibration fatigue
shock wave
