SiC颗粒增强铝基复合材料搅拌铸造过程数值模拟  

Numerical Simulation of Stirring Casting Process of SiC Particle Reinforced Al Matrix Composites

作　　者：毛安南 顿亚鹏 林锦明 杨伟[1] 杜安栋 张荻 MAO An-nan;DUN Ya-peng;LIN Jin-ming;YANG Wei;DU An-dong;ZHANG Di(Hubei University of Automotive Technology,Shiyan 442002,Hubei,China;Dongfeng Cummins Engine Co.,Ltd.,Xiangyang 441000,Hubei,China;Haixi(Fujian)Institute,China Academy of Machinery Science&Technology Ltd.,Shaxian 365500,Fujian,China)

机构地区：[1]湖北汽车工业学院,湖北十堰442002 [2]东风康明斯发动机有限公司,湖北襄阳441000 [3]机械科学研究总院海西(福建)分院有限公司,福建沙县365500

出　　处：《铸造》2020年第3期228-232,共5页Foundry

基　　金：国家科技重大专项资助项目(2019ZX04002030);十堰市级引导性科研项目(19Y125);湖北文化创意产业化设计研究中心开放基金(HBCY1911)。

摘　　要：使用Fluent软件对不同搅拌器形成的速度场、压力场和湍流动能进行数值模拟,并结合显微组织分析,比较了四叶直单桨、三叶螺旋单桨和双极螺旋单桨的速度场分布、压力场结构和湍流动能大小,以及其对SiC于熔体中分散的影响。结果表明:双极螺旋单桨形成的速度场中有轴向漩涡和径向循环,同时压力场中形成较大的负压通道利于颗粒进入熔体,湍流动能也大于两种单桨的湍流动能,带动更大范围的熔体运动,利于颗粒分散。通过显微组织观察,四叶直单桨没能形成良好的负压通道,颗粒未能充分进入熔体,三叶螺旋单桨搅拌形成的复合材料存在颗粒团聚现象,双极螺旋搅拌流场中轴向和径向速度都较大,压力场中形成较大的负压通道,搅拌范围广,形成颗粒分布较均匀的复合材料。The velocity field,pressure field and turbulent kinetic energy of different agitators were numerically simulated by Fluent software.Based on the microstructure analysis,the velocity field distribution,pressure structure and turbulent kinetic energy of four blade straight single propeller,three blade spiral single propeller and bipolar spiral single propeller were compared,and their influence on SiC dispersion in melt was also analyzed.The results show that there are axial vortex and radial circulation in the velocity field formed by the bipolar spiral single propeller,and the larger negative pressure channel formed in the pressure field is conducive to the particles entering the melt,and the turbulent kinetic energy is also larger than the turbulent kinetic energy of the two single propeller,which drives the melt to move in a larger range and facilitates the particles to disperse.Through microscopic observation,the four-blade agitator fails to form a good negative pressure channel in the flow field,and the particles fail to fully enter the melt;particle agglomeration exists in the composite materials formed by the three-blade agitator;the axial and radial velocities of bipolar spiral agitator flow field are both large,and a large negative pressure channel is formed in the pressure field,with a wide range of agitation,and a composite material with relatively uniform distribution of particles is formed.

关 键 词：搅拌铸造 复合材料 流场 显微组织 

分 类 号：TG172[金属学及工艺—金属表面处理]