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The free meniscus problem in the continuous casting of steel: a computational model of cast surface formation.

机译：钢连续铸造中的自由弯月面问题：铸件表面形成的计算模型。

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摘要

Oscillation marks appear as transverse grooves on the surface of continuously cast peritectic and Ultra Low Carbon steel products. They affect the topology of the continuously cast surface and can be the source of defects on products rolled from continuously cast material. Oscillation marks cannot be avoided with current casting technologies, and their origin is unclear. Among the many speculations on the causes of their formation, the hypothesis of a solidification and overflow of the meniscus is supported by physical evidence, but lacks a sound theoretical background. This work aims to show that the physical phenomena -- heat transfer, mass transfer and fluid flow -- involved in this hypothesis can reasonably explain the formation of oscillation makes; it also seeks to improve the continuous casting process so that oscillation marks are either minimized or eliminated.;Results of the derived model indicate that the standard conditions found in the meniscus area of a continuous caster are sufficient to explain the formation of oscillation marks: the meniscus can freeze during the oscillation cycle, and mold oscillation and strand withdrawal provokes a flow of molten steel over the frozen meniscus, which can lead to an oscillation mark. The predicted heat flux through the mold and surface profile respond to changes in casting parameters in the manner that an actual caster would respond to the same changes in casting parameters.;A numerical model of the meniscus area is designed such that all the phenomena explaining the formation of oscillation marks according to this theory are included. The heat transfer (including conduction, advection, solidification, radiation) and mass transfer (including fluid flow, moving boundary) equations are solved in a transient way that reflects caster operation. Given the complexity of the model and the difficulty of handling moving boundaries, particular consideration is given to the finite element solution of these differential equations. The model is carefully designed as a reasonable simulation of the continuous casting process particularly focused on the area of the liquid steel meniscus in the mold of a continuous caster; it does not suffer from assumptions made only to ease the solution of those differential equations.
机译：振荡痕迹在连续浇铸的包晶和超低碳钢产品的表面上以横向凹槽的形式出现。它们会影响连铸表面的拓扑，并且可能是由连铸材料轧制的产品上缺陷的来源。当前的铸造技术无法避免出现震荡痕迹，并且其起源尚不清楚。在许多关于其形成原因的推测中，弯月面凝固和溢出的假设得到了物理证据的支持，但缺乏良好的理论背景。这项工作旨在证明该假设所涉及的物理现象-传热，传质和流体流动-可以合理地解释振荡波的形成。推导模型的结果表明，在连铸机的弯液面区域发现的标准条件足以说明振动痕迹的形成：弯月面可能会在振荡周期中冻结，而结晶器的振荡和钢绞线的抽出会引起钢水在冻结的弯月面上方流动，从而导致振荡痕迹。通过铸模和表面轮廓预测的热通量以实际铸造者对铸造参数的相同变化的方式对铸造参数的变化做出响应。;设计了弯月面区域的数值模型，以使所有现象都能解释包括根据该理论的振荡标记的形成。传热（包括传导，对流，凝固，辐射）和传质（包括流体流动，移动边界）等式以反映脚轮运行的瞬态方式求解。考虑到模型的复杂性和处理移动边界的困难，将特别考虑这些微分方程的有限元解。该模型经过精心设计，是对连铸过程的合理模拟，尤其关注于连铸机结晶器中钢液弯月面的面积；它不只是为了简化这些微分方程的求解而作的假设。

著录项

  • 作者

    Moinet, Aymeric.;

  • 作者单位

    Carnegie Mellon University.;

  • 授予单位 Carnegie Mellon University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 309 p.
  • 总页数 309
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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