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聂祥樊,李应红,何卫锋,徐凌志,罗思海,李 翔,李一鸣,田 乐.DZ17G定向凝固高温合金微激光冲击强化方法与疲劳试验研究[J].稀有金属材料与工程(英文),2018,47(10):3141~3147.[Nie Xiangfan,Li Yinghong,He Weifeng,Xu lingzhi,Luo Sihai,Li Xiang,Li Yiming and Tian Le.Reseach on micro-scale laser shock peening method and fatigue experiment of DZ17G directional-solidified superalloy[J].Rare Metal Materials and Engineering,2018,47(10):3141~3147.]
Reseach on micro-scale laser shock peening method and fatigue experiment of DZ17G directional-solidified superalloy
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Received:January 08, 2017  Revised:October 08, 2018
DOI:
Key words: DZ17G directional solidified superalloy  micro-scale laser shock peening  high-density dislocations  micro-hardness  high-cycle fatigue
Foundation item:国家重点基础研究发展计划(项目号2015CB057400);国家自然科学基金(项目号51505496)
Author NameAffiliation
Nie Xiangfan,Li Yinghong,He Weifeng,Xu lingzhi,Luo Sihai,Li Xiang,Li Yiming and Tian Le  
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Abstract:
      Aim at the fatigue fracture fault of aero-engine directional solidified turbine blade, laser shock peening was suggested to be conducted on the DZ17G superalloy simulated blades to improve fatigue performance. However, in order to avoid the occurrence of grain refinement in the columnar crystals,a special laser shock treatment method, high frequency shock without ablation coating underwater based on micro-scale laser shock peening, was proposed. In this method, short laser pulse width micro-scale laser beam was conducted to decrease the plastically degree and affected depth, and high frequency shock without ablation coating was conducted to form a uniform plastically strengthening layer. The experiment results indicate that there are high density disloactions and dislocation tangles generated in the shallow layer of DZ17G superalloy simulated blade, but no grain refinement, and the density of dislocations decrease with the depth sharply. High density disloactions and dislocation tangles result in a high improvement of hardness, increased by 30%. However, There is a 180 thick hardened layer generated. The fatigue strength of DZ17G superalloy simulated blades is improved form 257.00 MPa to 302.00 MPa, increased by 17.5%. There is still a improvement of 11.7% on fatigue strength after thermal insulation for 2h under 800℃. High density disloactions and dislocation tangles are the immanent cause of fatigue performance improvement.