Based On Ansys Strong Pulsed Magnetic Field And Temperature Field Finite Element Analysis

The solidification microstructure of some alloys can be remarkably refined under the applied strong pulsed magnetic field. This is a new arisen technology with wide prospect. But the mechanism of the effect is still unknown. The distribution of magnetic field and the electromagnetic force in the melt under applied strong pulsed magnetic field are simulated with ANSYS FEM software in the present thesis. Through these studies, consults can be provided for the study of the effect of strong electromagnetic field on the solidification microstructure of alloy.It is well known that temperature field analysis is the important prerequisite for the study of all kinds of parameters, microstructure and performance of metal materials in solidification process. Whether the initial boundary conditions which tally with the actual situation can be correctly loaded is the key factor to temperature field analysis. By using the large-scale finite element analysis software-ANSYS based on equivalent thermal enthalpy finite element theory, the transient temperature field distribution in the solidification process of Al-4%Cu alloy, an aero-engine cast and nickel-base superalloy (K4169) blade was studied in details in this thesis.Through the studies of this paper, the following results were obtained:The magnetic field distribution characteristic of Al alloy directional solidification under applied pulsed magnetic field was simulated. And the simulation results were compared with the experimental data. Through the ANSYS simulation results, it was found that the distribution of the magnetic induction strength, electromagnetic force in the melt were nonuniform. For cylindrical sample, the magnetic induction strength and electromagnetic force reached the maximum beyond the range of solenoid coil, and the farther away from the cylindrical sample, the smaller these parameters were.In the study of Al-4%Cu alloy temperature field, the actual boundary conditions, such as the heat convection and heat radiation between Al-4%Cu alloy pouring surface and environment air, the heat convection among sand mold, cold Iron outer surface and environment air were carefully considered. On the basis of this study, thetemperature field distribution of an aero-engine cast was studied. The temperature field distribution of nickel-base superalloy low-pressure turbine blade used in aero-engine in investment casting process was simulated under the actual solidification process, and the dynamic temperature field distributions with the continuous changes of initial temperature and boundary conditions were obtained, which lay an important theoretical foundation for high temperature mechanics performance study of the superalloy cast, and also create essential prerequisite for the accurate simulation of microstructure evolution in solidification process.