Simulation Analysis And Experimental Research Of Laser Cladding Titanium Alloy TC4

TC4 titanium alloy is a kind of α + β phase titanium alloy of moderate strength.Currently,it is the most widely used titanium alloy,and mainly used in the fields of aeronautics,astronautics,medical treatment,engineering and so on.A considerable part of the aero-engine blades are made of TC4 titanium alloy.Aero-engine blades work in relatively harsh environment and are susceptible to be damaged,and laser cladding technology is frequently used to repair damaged blades.Laser cladding technology is a hot research topic in aviation field at present,with the advantages of high precision,easy realization of automatic control,fast processing speed,small heat-affected area and good bonding with substrate.In this paper,the temperature field in the experiment of laser cladding of TC4 titanium alloy was simulated by ANSYS,and relevant laser cladding experiments were carried out under that circumstance to verify and optimize the ANSYS model.Besides,the optimized process parameters and experimental environment of laser cladding of TC4 titanium alloy were obtained,which provided a theoretical basis and experimental reference for the further study on using laser cladding technology to repair TC4 titanium alloy blade.The main work of this paper is as follows:(1)According to the experimental experience of laser cladding and the knowledge of ANSYS modeling,the ANSYS model was established to simulate the distribution of temperature field in the process of laser cladding and to predict the influence of some related experimental parameters on laser cladding.(2)TC4 titanium alloy powder was clad on the surface of TC4 titanium alloy by laser under the same other process parameter to investigate the influence of laser scanning speed on the properties of cladding layer and the influence of experimental environment on cladding layer.Suitable laser scanning speed and experimental environment for laser cladding experiments were obtained after tests of SEM,EDS,micro-hardness and abrasion resistance.(3)The influence of laser power on laser cladding of TC4 titanium alloy was investigated and the lap joint experiment was carried out under the same other process parameter.Through the related functional tests,the optimized experimental parameters of laser cladding of TC4 titanium alloy were obtained.(4)Based on the results of relevant laser cladding experiments,the ANSYS model was optimized and some assumptions were modified,building a more suitable model for the simulation of laser cladding of TC4 titanium alloy,which is conducive to carry out some simulations of overlapping and multi-layer stacking.