| A blade is one of the most important mechanical components in aviation industry. Precision forging process of blade is a complex process with multi-factor effects. There's complicated relationship between deformation, heat transfer and microstructure evolution in blade forging process. Quality and macro-mechanical properties of parts largely depends on microstructure. It is important to predict and control the microstructure of the blade for improving over-all mechanical properties. Therefore, in this paper, coupling analysis of deformation-heat transfer-microstructure evolution based on finite element method in TC4 blade precision forging process is carried out, using constitutive equation reflecting microstructure evolution influence on flow stress and Yada prediction model of microstructure evolution, and serve on the determination of process parameters and control of blade quality. A brief introduction to the project and its main results are as follows:The key technical problems of coupled FEM deformation-heat transfer -microstructure evolution in TC4 blade precision forging process are studied. Based on the developed 3D-CTM system, 3D-CDHTM (3-Dimensional Coupled Analysis of 3-Deformation-Heat Transfer-microstructure evolution) is developed.By using the 3D-CDHTM system, FEM analysis of precision forging process of TC4 blade with tenon was carried out. And the results have been obtained for deformed mesh, equivalent stress field, equivalent strain field, equivalent strain rate, temperature field at various deformation degrees of typical sections and the laws of the blade precision forging is revealed.Microstructure (grain size and volume fraction) of TC4 blade are predicted under various deformation temperature, velocity, die temperature and friction factor and the influence of deformation parameters on microstructure is studied and analyzed thoroughly and systematical. Meanwhile, the influence of various deformation parameters on load-stroke curve is analyzed.
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