Modeling of the Microstructure Evolution in Continuously Cast Al-pb Alloys  

作　　者：JiuzhouZHAO L.Ratke 

机构地区：[1]InstituteofMetalResearch,ChineseAcademyofSciences,Shenyang110016,China [2]InstituteforSpaceSimulation,DLR,D-51140Cologen,Germany

出　　处：《Journal of Materials Science & Technology》2002年第4期306-310,共5页材料科学技术（英文版）

摘　　要：A numerical model is presented describing the microstructure evolution of an immiscible alloy under the continuous casting conditions. Calculations are carried out to investigate the microstructure evolution in a vertical strip cast sample of Al+5wt pct Pb alloy. The numerical results show that there exists a peak value for the supersaturation in front of the solid祃iquid interface, and the minority phase droplets are nucleated in a region around this peak. Under strip casting conditions the Marangoni migration dominates the motion of droplets. This leads to an accumulation of the minority phase droplets in front of the solid祃iquid interface.A numerical model is presented describing the microstructure evolution of an immiscible alloy under the continuous casting conditions. Calculations are carried out to investigate the microstructure evolution in a vertical strip cast sample of Al+5wt pct Pb alloy. The numerical results show that there exists a peak value for the supersaturation in front of the solid祃iquid interface, and the minority phase droplets are nucleated in a region around this peak. Under strip casting conditions the Marangoni migration dominates the motion of droplets. This leads to an accumulation of the minority phase droplets in front of the solid祃iquid interface.

关 键 词：Immiscible alloy Continuous casting MICROSTRUCTURE Numerical simulation 

分 类 号：TG27[金属学及工艺—铸造] TG249.7