摘要
为提高涡轮叶片疲劳寿命,探索了一种利用水下激光冲击强化方法处理涡轮叶片残余应力的技术。利用波长532 nm、脉宽10 ns、能量1.2~1.5 J、光斑直径1.0 mm的YAG激光器,对涡轮叶片榫齿部位进行了激光冲击强化处理。结果表明,水下激光冲击强化方法能有效消除、调整机械加工残余应力。当激光功率密度大于2.5 GW/cm^2且小于7.5 GW/cm^2时,随着功率密度的增加,表面残余应力也相应增加;当功率密度大于10.0 GW/cm^2后,表面残余压应力随功率密度的增加而明显降低;功率密度等于7.5G W/cm^2时,表面残余应力为-419.5 MPa,为最佳。
In order to improve the fatigue strength of turbine blade,the blade laser shock peening(LSP)method was studied.The turbine blade root was treated with YAG laser,by using the laser wavelength of 532 nm,plus width of 10 ns,energy of 1.2~1.5 J,and spot diameter of 1.0 mm.The results indicate that the LSP relieves and adjusts residual stress.For the laser power density range I 0,when 7.5 GW/cm 2>I 0>2.5 GW/cm^2,with the increasing of the power density,the surface residual stress also increases accordingly.When the power density above 10.0 GW/cm^2,surface residual compressive stress decreases significantly as power density continues to increase.In the case of I 0=7.5 GW/cm^2,the surface residual stressσ=-419.5 MPa is the best parameter.
作者
高伟
郭颖涛
南凯
GAO Wei;GUO Yin-tao;NAN Kai(The Military Office in Xi’an,Xi’an 710021,China;The Military Office in Baoji,Baoji 721000,China)
出处
《燃气涡轮试验与研究》
北大核心
2020年第2期30-33,共4页
Gas Turbine Experiment and Research
关键词
涡轮叶片
激光冲击强化
疲劳寿命
表面处理
残余应力消除
冲击波
turbine blade
laser shock peening
fatigue life
surface treatment
relieving residual stress
shockwave
