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Analysis of Internal Cracks in Continuous Casting Slabs with Soft Reduction

机译：轻型连铸板坯内部裂纹分析

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摘要

The formation of internal cracks in continuous casting slabs is mainly attributed to the strain status and microsegregation near the solidifying front of the slabs. By analyzing the internal cracks of medium carbon microalloy steel, the obtained conclusions are that C, P, S, etc. enrich in dendrites and exist in grain boundaries, but these are just the internal causes, and the root cracking causes the tensile stress of solidification front. When the slab passes through the straightening segments, the liquid core thickness is large, and the liquid steel in the space of columnar crystals is not completely frozen. Therefore, the reduction effect of rollers results in the strain of solidification front exceeding the critical value. However, the corresponding strain in the arc and horizontal segments does not exceed this critical value, so the solidification front in the straightening segments would be much easy to crack. The statistics analysis shows that after soft reduction and straightening process are separately carried out, the occurrence rate of intermediate cracks is reduced by 41.3%.
机译：连铸板坯内部裂纹的形成主要归因于板坯凝固前沿附近的应变状态和微观偏析。通过分析中碳微合金钢的内部裂纹，得出的结论是，C，P，S等富集了枝晶并存在于晶界中，但这仅仅是内部原因，而根部裂纹会引起合金的拉伸应力。凝固前沿。当板坯通过矫直段时，液芯厚度大，并且柱状晶体空间中的钢水没有完全冻结。因此，辊的减小效果导致凝固前沿的应变超过临界值。但是，弧形段和水平段中的相应应变不会超过此临界值，因此矫直段中的凝固前沿将很容易破裂。统计分析表明，分别进行软压下和矫直处理后，中间裂纹的发生率降低了41.3％。

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  • 来源
    《High temperature materials and processes》 |2016年第3期|269-274|共6页
  • 作者

    Bo Wang; Jiongming Zhang; Chao Xiao; Shunxi Wang; Wei Song;

  • 作者单位

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    internal cracks; continuous casting slab; strain analysis; microsegregation; finite element model;

    机译：内部裂缝;连铸板坯应变分析微偏析有限元模型;

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