Research Of Microstructure Evolution Law And Hot Plastic Deformation Behavior For Alloy GH4169

As a structural material with so many excellent properties, GH4169 alloy has been far-ranging used in aeronautical and aerospace areas. Based on high temperature compression deformation experiments, this thesis systematically analyzed the GH4169 alloy's hot deformation and the microstructure evolution behavior, established the relationship between the flow stress, the hot deformation parameters, the dynamic recrystallization model, the hot processing maps based on DMM. Using the Deform-3D software to finite element numerically simulate the extrusion process of the leaf blade. Analyzed the deformation process under different hot performing process parameters, below are the primary detailed conclusions:(1) Through the single channel compression experiment under high temperature, used Origin software to map the true stress-strain curve of alloy GH4169, studied the effect by hot working process parameters on the rheological stress and deformation resistance. Base on Zener-Hollomon theory, built the flow stress constitutive equation in the heat, provided a reliable mathematical model for the finite element numerical simulation.(2) After high temperature deformation, observed the microstructure by electron back-scattered diffraction (EBSD) technique, transmission electron microscope (TEM) observations as well as the optical microscope. Analyzed the dynamic recrystallization volume fraction and the recrystallization grain size under different thermal deformation status, established models of dynamic recrystallization and recrystallization grain size, implemented the accurate prediction in the whole process of dynamic recrystallization.(3) Based on the theory of DMM, studied the processing maps in detail.According to the quantitative data collected by the single channel compression experiment, drew the hot performing process maps of GH4169 alloy under different strain. Combined with the microstructure, add up with the analysis of the safe regions and instable regions on the processing maps, optimized the hot working processing.(4) Using Deform-3D software, simulated the extrusion process of the GH4169 alloy leaf blade. According to the analyze of grain size distribution uniformity and the degree of grain refinement, get the suitable parameters for the extrusion forming process. Provide the basis for optimizing the hot performing process of GH4169 alloy.