Abstract
Radial contraction behavior during solidification of cylindrical Al-3 mass%Si alloy ingots with and without degassification was investigated in relation to pouring temperatures. The macrostructure of the conventionally cast ingots changed from columnar to fine equiaxed morphology with decreasing pouring temperature, and the fraction solid of solidifying shell corresponding to the beginning of contraction varied concurrently from 0.56 to 0.77. The amount of contraction of the ingot till the end of solidification decreased with decreasing pouring temperature, and the amount of the contraction of the degassed ingot was larger than that of the non-degassed ingot at the same pouring temperature.The comparison between the measured contraction and the estimated thermal contraction showed that the amount of the contraction of solidifying shell consisted of two components, i.e. thermal contraction of dendrite network and the solid deformation due to negative pressure developed in interdendritic liquid. Furthermore, it was shown that the density of the ingot with a large contraction was higher than that of the ingot with a small contraction.
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