摘要
对比分析了传统电火花、电液束及长脉冲激光加工在航空发动机单晶涡轮叶片气膜孔加工品质、加工精度或加工效率等方面的优势与不足,指出飞秒激光技术可为单晶叶片高品质气膜孔加工提供解决方案。为此,重点分析了飞秒激光'冷加工'特性及机理,并介绍了能量损伤阈值的基本理论及试验测定方法;同时,概述了飞秒激光烧蚀机理的数值计算模型及方法,提出结合双温度场模型的分子动力学方法是数值模拟的发展方向。
It was reviewed comparatively for the advantages and disadvantages of traditional electrical discharge machining(EDM),electron-chemical machining(ECM)and long pulsed laser processing on the hole wall quality,accuracy and efficiency of film cooling hole processing.Femtosecond laser provided a solution for high-quality film cooling hole processing.For femtosecond laser drilling,its'cold processing'characteristics and mechanism were described,and the basic theory of damage threshold and experimental calculation method were analyzed.At the same time,numerical calculation models and methods of femtosecond laser ablation mechanism were summarized.It is pointed out that the molecular dynamics method(MD)combined with the two-temperature model(TTM)is the quite promising for numerical simulation.
作者
王祯
杨泽南
张朕
张强
Wang Zhen;Yang Ze′nan;Zhang Zhen;Zhang Qiang(National Key Laboratory of Science and Technology on Advanced High Temperature Structure Materials,AECC Beijing Institute of Aeronautical Materials;State Key Laboratory of Rolling and Automation,Northeastern University)
出处
《特种铸造及有色合金》
CAS
北大核心
2019年第8期838-842,共5页
Special Casting & Nonferrous Alloys
基金
中国航空发动机集团产学研合作资助项目(HFZL2018CXY022)
关键词
气膜冷却孔
飞秒激光加工
能量损伤阈值
数值模拟
Film Cooling Hole
Femtosecond Laser Drilling
Energy Ablation Threshold
Numerical Simulation
