中文摘要：

鉴于在为连续扔的平板，温度坡度的变化和在稳固液体的接口的前面边的树枝状的间距的团结过程的稳固液体的接口的周期的弯曲变丑，并且快克的成核和繁殖进程是 studied.It 被显示出接口的弯曲变丑沿着拉 directio 在温度坡度的稳固液体的接口，和出现的前面边导致温度领域变化在团结的中间、最后的阶段期间形成的起始的裂缝可以延长到扔的平板的表面并且成为一个内部裂缝。理论分析的结果是基本上与实验的一致。

英文摘要：

In view of the periodic bending deformation of solid-liquid interface in the solidification process for continuous casting slab, the variation of temperature gradient and dendritic spacing in the front edge of the solid-liquid interface, and the nucleation and propagation process of crack were studied. It is shown that the bending deformation of the interface results in the temperature field change in the front edge of solid-liquid interface, and the occurrence of temperature gradient along drawing direction results in the growth of secondary dendrites. The initial crack formed during the middle and final stage of solidification may extend to the surface of the casting slab and become an internal crack. The results of the theoretical analysis are basically in agreement with that of the experiment.