| Many casting is founded by general industrial alloys consist of multiple components. The mechanical properties and durability property of the casting lie on the solidification microstructure of the casting. Modeling of microstructure formation using phase-field model will help to evaluate and optimize the castings processing technology so as to improve their quality. In this paper, we use Fe-C-P alloy as an example to study the solidification process of multiple components alloys.In this study, we used the phase-field model extended by KKS model, coupled two concentration field is used to simulate dendrite growth of grains for Fe-C-P alloy in 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 achieve the coupling of the macro field and the micro field.In simulation, we mainly studied the influence of different anisotropy coefficients, undercooling on shapes of dendrites and distribution of solute for single grain; The influence of different anisotropy coefficients, undercooling on shapes of secondary branch of dendrite and distribution of solute in secondary branch of dendrites; The growth and remelting of secondary branch and tertiary branch of dendrite were reappeared in the simulation. At last, we studied the influence of the secondary solute on shapes of secondary branch of dendrite, and the influence of the secondary solute on distribution of the first solute in secondary branch of dendrites. The calculation results indicate that, with the increasing of anisotropy coefficient and undercooling, the upgrowth of side-branches are flourish. The solute segregation of the first solute in secondary branch of dendrites comes remarkably with the increase of the secondary solute. |
