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

Jiuzhou ZHAOInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaL.RatkeInstitute for Space Simulation, DLR, D-51140 Cologne, Germany

摘 要：<正>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 solidiquid 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 solidiquid interface.

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