【摘要】 以凝固理论、传热学原理和灰铸铁凝固特性等为基础,采用热力学方法与动力学方法相结合的模拟技术建立灰铸铁模拟框架。对初生奥氏体析出采用热力学计算模型,建立固相率与温度的关系;对共晶相采用动力学计算模型,即形核生长的计算模型,通过建立生长速度与过冷度的关系来确立固相率与过冷度的关系。通过对阶梯形铸件的实验和模拟的数据对比,验证了此方法可以正确地描述灰铸铁凝固过程的行为。更多还原

【Abstract】 Based on the solidification theory,heat transfer theory,and solidification characteristics of gray iron,thermodynamics method and dynamic method were combined effectively to build the framework of gray iron simulation.The solidification process was divided into two main stages-precipitation of primary phases and eutectic solidification.At the former stage,the relationship between solidification ratio and temperature was established,while at the later one,solidification ratio was calculated through the nucleation and growth model.An experiment was designed to verify the simulation models.With the agreement between the simulation results and the experiment results,it turns out that the models can accurately simulate the solidification process of gray iron.更多还原