球墨铸铁微观组织形成的数值模拟

基于结晶动力学理论，建立了球墨铸铁凝固过程各阶段微观组织形成形核和长大的数学模型；根据该结晶动力学模型，编制了球铁微观组织形成模拟软件FTStructure．该软件可以预测球铁凝固过程中各相的形成以及固态转变中铁素体和珠光体的形成，并进而预测铸态力学性能．模拟了阶梯形试块的冷却曲线、微观组织和布氏硬度．模拟与实测结果符合较好．

Numerical Simulation of Microstructure Formation of Spheroidal Graphite Cast Iron

The nucleation and growth models of the microstructure formation of spheroidal graphite cast iron from solidification down to room temperature were estab-lished according to the existing solidification kinetics theories. Based on the solidifocation kinetics models, a 3D finite difference code, FTStructure, has been developed to simu-late the formation of microstrucures and to predict the as-cast mechanical properties of the SG iron. The cooling curves, microstructures and Brinell hardness of SG iron speci-mens were simulated. Good agreement was obtained between the calculated results and those of experiments.