Simulation And Prediction Of Microstructure For Superalloy GH4169in Thermal Deformation

The thermal forming process of super alloy GH4169is very complex, especially theprocessing of large forging forming. Thus, there is necessary to establish accurate effectivemicrostructure evolution model through experiments. More reasonable and effectiveprocess plans are concluded through the simulation of the microstructure change ofsuperalloy GH4169in the process of hot forming by model.In this paper, the hot compression experiments were made on Gleebel hot simulationexperiment machine. The stress and strain curves about superalloy GH4169underdifferent thermal deformation temperature, strain rate and different time interval wereobtained in these experiments.Through the analysis of experimental data and relatedmetallographs, the microstructure changes on the dynamic recrystallization process, themetadynamic recrystallization, the static recrystallization process and static grain growthprocess were investigated.The influence of each thermal deformation parameters torecrystallization grain size, the average grain size and the recrystallization volume fractionwere analyzed. On this basis, the flow stress equations and the microstructure evolutionmodels were established.The models were import into the Deform-3D finite element software and the macroand micro simulations in the thermal forming process of superalloy GH4169forgings. Theevolution of forming and the internal microstructure of forgings in the simulation processwere understand. The model parameters are modified by comparing the simulation resultsand the actual condition of experiment results in the same thermal deformation conditions.So,the model will be more accurate and reliable.