Abstract

Mold oscillations, widely used in continuous casting for infiltrating the mold flux between the mold and the solidified shell, change periodically the heat flux from the meniscus to mold. These variations of the heat flux affect the solidification behavior near an initial solidification position. Because the surface shape of the solidified shell is influenced by the initial solidification behavior, it is important to understand the relation between the mold oscillation, the heat flux and initial solidification behavior. In the present study, we developed a numerical model that simulates the flow and thermal behavior of the mold flux near the meniscus. Using this model, we analyze the effects of the variations of the heat flux from the meniscus on the initial solidification position and suggest the formation mechanism of the oscillation marks (OMs) and the hooks. Also, we will present quantitative results about the depth of the OMs and the length of the hooks at the conditions used in the present study. The factors that influence the hooks’ types and the causes of the irregularity of the shell surface are also discussed.

Graphic Abstract

中文翻译：

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弯月面释放的热通量变化对连铸凝固壳表面形状的影响

摘要

结晶器振动，广泛用于连续铸造中，以渗透结晶器和凝固的壳体之间的结晶器通量，周期性地改变从弯月面到结晶器的热通量。热通量的这些变化影响初始凝固位置附近的凝固行为。由于凝固壳的表面形状受初始凝固行为的影响，因此重要的是要了解结晶器振动，热通量和初始凝固行为之间的关系。在本研究中，我们开发了一个数值模型，用于模拟弯月面附近的熔剂流动和热行为。使用这个模型，我们分析了弯液面的热通量变化对初始凝固位置的影响，并提出了振荡痕迹（OMs）和弯钩的形成机理。同样，在本研究中使用的条件下，我们将提供有关OM深度和钩子长度的定量结果。还讨论了影响弯钩类型的因素以及壳体表面不规则的原因。

图形摘要