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首页> 外文期刊>鋳造工学 >Effects of casting conditions on solidification structure and banded segregation of Al-4.4% Cu alloy produced by centrifugal casting
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Effects of casting conditions on solidification structure and banded segregation of Al-4.4% Cu alloy produced by centrifugal casting

机译：铸造条件对离心铸造Al-4.4％Cu合金凝固组织和带状偏析的影响

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摘要

The effects of casting conditions on solidification structure and banded segregation of Al-4.4% Cu alloy produced by centrifugal casting were investigated. Addition of grain refiner caused three zones in the radial direction ; equiaxed, fineequiaxed, and coarse equiaxed zone. Banded segregation was formed in the fine equiaxed zone obtained by horizontal centrifugal casting with smaller centrifugal forces than 100 G. Smaller centrifugal force resulted in more numbers of banded segregation. No banded segregation was observed in the ingot obtained by vertical centrifugal casting. The effects of superheat and vibration were small. The grain size in the banded segregation was 150μm which was double that in the neighboring phases. Cu concentration was low in the equiaxed zone, and high in the fine equiaxed zone. It was about 5.6% in the banded segregation, larger than that in the neighboring fine equiaxed zone (about 4.9%). It is believed that the flow in the solid-liquid coexisting region causedby gravity force resulted in the banded segregation.
机译：研究了铸造条件对离心铸造Al-4.4％Cu合金凝固组织和带状偏析的影响。晶粒细化剂的加入引起径向上的三个区;等轴，精细等轴和粗等轴区。在水平离心铸造得到的细等轴心区中形成带状偏析，离心力小于100G。离心力越小，带状偏析的数量越多。在通过垂直离心铸造获得的铸锭中未观察到带状偏析。过热和振动的影响很小。带状偏析的晶粒尺寸为150μm，是相邻相的两倍。等轴区的铜浓度低，细等轴区的铜浓度高。带状偏析约为5.6％，大于邻近的细等轴区的4.9％。可以认为，重力引起的固液共存区域的流动导致带状偏析。

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