Simulation Of Superalloy Blade Extrusion Forming Process And Die Structure Optimization

Blade extrusion forming process has been used as one of the indispensable in the performing process. It not only can be the pre-process for the blade forging, roll forming, but also can make the blade billet after extrusion forming have a good microstructure performance. Because of the need for a large number of experiments when obtaining the optimal blade extrusion forming process parameters, it will cost a lot and effect the production cycle.With the development of the computer numerical simulation, this paper will use the finite element method to simulate the blade extrusion forming process as well as analyze the law of extrusion forming process and the influence factors of the GH4169alloy blades. In the end, this paper will give the appropriate extrusion forming process parameters in a certain evaluation criterion. It will reduce the cost and the time and predict the performance of the productions.Some main points of this paper are as follows:(1) After reading a large number of the domestic and foreign publications, this paper will give a brief intro of the characteristics and development of the GH4169alloy, the characteristics of the extrusion forming process, the research of the microstructure and die structure optimization.(2) The cylindrical billets of the GH4169alloy are experimented on the thermal simulation experiment machine MMS-300. By using the obtained experimental data, the constitutive equation and the microstructure evolution mathematical model of GH4169alloy will be established.(3) The FORTRAN language is used for developing the finite element software DEFORM-3D. The constitutive equation and the microstructure evolution mathematical models of GH4169alloy are embedded into the user subroutine of DEFORM-3D. It will help DEFORM-3D have the function of microstructure evolution prediction. (4) The3D models of the blade billet and the extrusion dies will be established by using the CAD software UG. Then, these3D models are imported into DEFORM-3D to simulate the extrusion forming process of the GH4169alloy blade. According to the grain size distribution uniformity and the degree of grain refinement of blade billet after extrusion forming simulation, this paper will propose the suitable parameters during the extrusion forming process.(5) Under the optimal parameters of the extrusion forming, this paper will analyze the die fillet radius on the quality of the blade extrusion and this paper will give the appropriate die fillet radius.