| In the manufacturing process of components for aircraft aero engines and steam turbines,a large number of high-performance metal materials such as titanium alloys and high-temperature alloys are used.Because GH4169 superalloy has excellent performance under high temperature environment,it is often used in the manufacture of aeroengine turbine discs.When the aero engine is running at high speed,stress concentration is likely to occur in parts with complicated structures such as tenon grooves and tenons of the turbine disk,which directly affects the service life of the turbine disk.Due to its excellent impact processing effect,laser shock processing technology Significant technical advantages such as strong controllability can generate a favorable residual compressive stress layer on the surface and inside of the material,thereby significantly improving the surface performance of the metal material.Based on the GH4169 superalloy as the material sample,this article carries out the application research of laser shock processing technology,which provides a reference for the laser shock processing technology of the tenon groove of the turbine disk.1.Accurate quantification study of laser optical path interference and oblique impact angle of turbine disk tenon slot.Because the laser beam interferes with the adjacent parts of the part to be laser shock strengthened,and the precise quantification of the oblique incidence angle of the laser is the key difficulty in the application of laser shock processing technology in some small-sized structure parts.Aiming at the above two prominent problems,the small size aeroengine turbine disk tenon groove is used as the research object,and the offline programming simulation software Moto Sim EG VRC of the industrial robot is used for simulation analysis,which can effectively solve the problem of beam interference and ensure that the laser beam can The reach of the laser impact processing area of the turbine disk tenon groove and the precise quantification of the oblique impact angle range in different areas of the turbine disk tenon groove.2.Numerical simulation study on laser shock processing of GH4169 superalloy sample.Based on the ABAQUS simulation platform,a GH4169 superalloy numerical simulation analysis model was constructed.Through finite element numerical simulation,the surface and along the depth of the material were analyzed under the effects of laser power density(peak pressure),spot overlap rate,and number of oblique impacts.And analyze the residual stress distribution in the direction.Result surface: With the increase of peak pressure,spot overlap rate,and the number of oblique impacts,the residual compressive stress on the surface and in the depth direction increases,while the increase will decrease.The influence of laser process parameters on the change of surface topography and roughness is also analyzed.3.Experimental research on the process parameters of laser impact processing technology of GH4169 high temperature alloy specimen.The laser shock processing experiment of the superalloy sample was completed,and the distribution status and size of the residual stress field and microhardness distribution on the surface and inside of the material after different laser energy,different impact times,and three different laser energy combinations were studied.State and size,surface features and roughness.The results show that: after the GH4169 superalloy undergoes laser shock processing treatment,the residual compressive stress,microhardness and roughness on the surface of the material increase with the increase of energy and times.The hardness will also increase with the increase of the above two parameters;however,due to the hardening phenomenon of the material after laser shock processing,increase the laser energy after two shock processing or adopt a gradient energy combination for laser shock processing treatment.It can more effectively improve the performance of the material surface,making the effect of laser shock processing better. |
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