Reserch Of The Hole Drilling Of K24 Superalloy Technology By Femtosecond Laser

Femtosecond laser with the features of ultrashort pulse duration and ultrahigh peak power can achieve ―cold‖ machining. The recast layer and micro-cracks of the hole wall can be reduced effectively by applying femtosecond laser in processing air-film holes on turbine blades, and the machining accuracy and consistency of the hole shape will increase. Therefore, it shows a significant advantage in the process of air film hole. In this paper, the physical mechanism of femtosecond laser interaction with metal materials was analyzed, and the theoretical simulation and experimental research on the processing technology of K24 superalloy by femtosecond laser at 342 nm were carried out.Through the analysis of the relevant research at home and abroad, the femtosecond laser ionization mechanism of the material has been investigated, besides the energy deposition mechanism and the model of material removal has been analyzed when the femtosecond interact with metals. Based on the Planck equation, using the corresponding mathematical deduction, the mathematical model of the material absorption of laser energy has been established to obtain the material absorption coefficient and the reflection coefficient to the laser energy. Establishing the theoretical model of the electron–phonon coupling under the femtosecond laser pulse through the Two-temperature model to provide theory basis for the simulation study of femtosecond laser irradiation with metal materialCarrying out the study on the simulation analysis of electron lattice temperature imbalance when femtosecond laser ablation of the K24 superalloy with finite element analysis method, determining the energy coupling process of K24 superalloy materials in the femtosecond laser induced and verifying the model through experiment.Doing experimental research on the hole drilling of K24 superalloy by femtosecond laser using femtosecond laser equipment. Through the theory analysis and experiment comparison of different laser hole drilling methods, reasonable choice of spiral machining method. Respectively using single factor test and orthogonal test method to study the hole drilling experimental of K24 superalloy by femtosecond laser, obtained the influence rule of scanning speed, scanning frequency and feeding distance and the energy of laser on pore size and morphology. By comparing the morphology of the inlet and outlet, the processing qualit y of the inner wall of the hole, and the taper, the advantage of femtosecond laser is verified.