湍流作用下过冷度对铝合金枝晶生长的影响  

Effect of Undercooling on Dendrite Growth of Al Alloy in Turbulence Flow

作　　者：龙文元[1] 王伟[1] 王刚[1] 

机构地区：[1]南昌航空大学航空制造工程学院,江西南昌330063

出　　处：《铸造技术》2014年第2期228-230,共3页Foundry Technology

基　　金：国家自然科学基金资助项目(51165036)

摘　　要：以改进的KKS模型为基础,通过耦合湍流情况下的流动控制方程组,模拟了紊流作用下Al-2.5%Cu合金在等温凝固过程中过冷度对枝晶生长形貌和溶质场分布的影响。结果表明,随着初始温度的升高,过冷度降低,枝晶生长速度变慢,固相和固-液界面前沿溶质浓度降低。The effect of undercooling on the dendrite growth morphology and solute distribution of Al-2.5%Cu alloy during isothermal solidification was investigated by coupling flow governing equation group in turbulence case based on the improved KKS model. The results indicate that the undercooling decreases with the increase of initial temperature, so the dendrite growth velocity and the solute concentration of both solid phase and the solid-liquid interface front decrease.

关 键 词：相场法 枝晶生长 湍流 k-ε模型 

分 类 号：TG146.21[一般工业技术—材料科学与工程]