Within a suitable range of temperature gradient, channel segregation is easy to develop when solidification rate is slow.
对适当范围的温度梯度，凝固速度较小时通道偏析易于形成。
The research development of channel segregation (freckle) during solidification in multi-component systems is discussed, including the freckle characteristic, influencing factor and physical feature.
对多组元复杂体系（尤其是高温合金体系）在凝固过程中形成的通道偏析即黑斑的研究现状进行了评述，包括黑斑的存在方式、影响因素和物理特征等。
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