| Casting difficult to guarantee the quality of products and high rejection rate, its mechanical properties and serving life of castings largely depend on the microstructures in solidification, so modeling of microstructure formation will help to evaluate and optimize the castings processing technology so as to improve their quality. The phase field method is a computing technology, the investigators can simulate the microstructures directly with it. In this study, based on phase-field model, we use Fe-C-P alloy as an example to study the formation process of multi-alloy microstructure.In this paper, based on the ternary alloys phase-field model under the condition of non-isothermal extended by KKS binary alloys model, coupled three concentration fields (phase-field,solute field and temperature field)are used to simulate dendrite growth of grains for Fe-C-P alloy in non-isothermal solidification process. The anisotropies of surface energy and kinetics are considered and the thermal noise is introduced into the energy conservation equation. In the process of simulation, the Visual C++ 6.0 was used to calculate the program and the Tecplot 9.0 was used to achieve the vision of results. In order to save time of calculation and improve the efficiency, an interpolative method is used to solve equations.In this paper, the solidification processes were analyzed and compared between the conditions of isothermal and non-isothermal, for example, the dendrite morphology,solute distribution,solute segregation,velocity of dendrite tip. Studied the impact of field parameters, for example, the impact of thermal conductivity to dendrite morphology,temperature distribution,the maximum temperature, the impact of anisotropy coefficient to dendrite morphology,temperature distribution,velocity of dendrite tip, the impact of interface thickness to dendrite morphology,temperature distribution,velocity of dendrite tip. Also the impact of P content to dendrite morphology,temperature distribution,solute C segregation. |
