论文部分内容阅读
以相场模型为基础 ,采用宏微观耦合方法和界面捕获液态方法对铝合金枝晶生长进行模拟计算 .为解决试样全场微观计算的困难 ,采取宏微观耦合的计算方法 ,试样整体计算温度场 ,而微观组织计算只在一个确定的宏观单元内进行 ,宏观微观计算交替耦合进行 .在不改变相场模型的条件下 ,提出界面捕获液态计算方法 .赋值计算单元界面标志 ,只对界面处的单元求解相场变量 ,当枝晶生长时 ,捕获液态单元为界面从而推进界面 ,并对捕获到的单元校正相场变量 .通过界面捕获液态方法加速相场模型的计算 ,实现了铝合金试件局部三维单晶粒和多晶粒的模拟 .对模拟结果与实际试样的金相结果进行分析和比较 .
Based on the phase field model, the dendrite growth of the aluminum alloy was simulated by using the macro-micro coupling method and the interfacial capture liquid method. In order to solve the difficulty of the microscopic calculation of the whole field of the sample, a macro-micro coupling calculation method was adopted to calculate the whole sample Temperature field, and the calculation of microstructure is only carried out in a certain macroscopic unit, and the coupling of macroscopical and microscopic calculation is carried out alternately.With the condition that the phase field model is not changed, Phase unit is used to solve the phase field variable, and when the dendrite grows, the liquid cell is captured as the interface to promote the interface, and the phase unit of the captured cell is corrected. Through the calculation of the liquid phase method to accelerate the phase field model, Simulation of Local Three-Dimensional Single-Grain and Multi-Grain of the Specimen The metallographic results of the simulated and actual specimens were analyzed and compared.