The columnar-to-equiaxed transition (CET) was observed in brass samples directionally solidified from the chill zone in different solidification conditions. The transition occurs when the gradient in the liquid ahead of the columnar dendrites reaches values between - 2.23 °C/cm and 1.05 °C/cm and the growth velocities reach values between 0.13 cm/s and 0.34 cm/s. The microstructure obtained is analyzed taking into account the characteristics of the alloy and the temperature profiles at the solidification interface. The variation of the primary and secondary dendritic spacings along the length of the sample is analyzed and the values experimentally measured are compared with results predicted by different theoretical models.
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机译：在不同的凝固条件下，从冷却区定向凝固的黄铜样品中观察到柱状到等温转变（CET）。当柱状树突之前的液体中的梯度达到-2.23°C / cm和1.05°C / cm之间的值并且生长速度达到0.13 cm / s和0.34 cm / s之间的值时，就会发生过渡。考虑到合金的特性和凝固界面的温度分布，对获得的微观结构进行了分析。分析了沿着样品长度的主要和次要树突间距的变化，并将实验测量的值与不同理论模型预测的结果进行了比较。
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