Study On Laser Shock Peening Process And Property Of TC17 Titanium Alloy Blades

In this paper,the TC17 titanium alloy blade of aero-engine was studied.The surface modification was carried out by advanced laser shock peening.The effect of laser parameters on the performance of the blade was studied.The optimum process parameters were found and the optimized process method was formed,which laid a foundation for the application of laser shock peening in TC17 titanium alloy blade.Firstly,with the help of ABAQUS finite element simulation technology,the effects of different pulse width and material thickness on laser shock wave propagation velocity and residual stress distribution under the same process parameters are studied.Compared with the experimental results,the selection and prediction of process parameters are completed.In this paper,the laser shock peening parameters of aero-engine blade material TC17 titanium alloy were studied systematically.The effects of different laser parameters on its micro-hardness,surface and depth residual stress,fatigue life,surface roughness and deformation were studied.The optimum process parameters were explored and the process window was optimized.The method of prolonging life by laser shock peening under multi parameters is obtained.The results show that under the condition of 480 MPa stress level and 2×10~7 cycles,all the simulated parts strengthened by laser shock pass the test,and the cycles are one order of magnitude higher than those of the non-strengthened ones.The deformation meets the requirements of design specifications,and lays a foundation for the application of laser shock peening technology in TC17 titanium alloy integral blade disc components.Because of the complexity of the factors affecting the laser shock peening effect,this paper systematically analyzes the process stability and equipment stability measures,summarizes four main factors affecting the strengthening effect,and explores the relationship between process parameters and residual stress and strengthening effect.Based on the vibration fatigue life as the core parameter,a comprehensive evaluation method for the characterization of laser energy,residual compressive stress method,Almen test method,depth-of-field microscopy method,surface micro-hardness and surface roughness is preliminarily established in order to solve the process stability of laser shock peening in industrial applications.The problem is guaranteed.