Abstract
Effect of non-equilibrium solidification conditions on the eutectic and post-eutectic reactions temperature and percentage of the phases were investigated using computer-aided cooling curve thermal analysis. In addition, hardness, secondary dendrite arm spacing, and maximum pore size were studied at different cooling conditions. Cooling curves were determined by setting thermocouples in the center of the molds. Solid fractions were calculated by Newtonian baseline technique. Results showed that increasing the cooling rate shifted the temperature of post-eutectic reaction upward, except final reaction. Higher cooling rate increased eutectic percentage about 4 %, but reduced total percentage of post-eutectic phases. Additionally, increasing the cooling rate shortened the maximum porosity diameter and secondary dendrite arm spacing and increased the hardness of the alloy.
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