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<p>The impact of heavy reduction on dendritic morphology was explored by combining experimental research and numerical simulation in metallurgy, including a detailed three-dimensional&#xa0;(3D) analysis and reconstruction of dendritic solidification structures. Combining scanning electron microscopy and energy-dispersive scanning analysis and ANSYS simulation, the high-precision image processing software Mimics Research was utilized to conduct the extraction of dendritic morphologies. Reverse engineering software NX Imageware was employed for the 3D reconstruction of two-dimensional dendritic morphologies, restoring the dendritic characteristics in three-dimensional space. The results demonstrate that in a two-dimensional plane, dendrites connect with each other to form irregularly shaped “ring-like” structures. These dendrites have a thickness greater than 0.1&#xa0;mm along the <i>Z</i>-axis direction, leading to the envelopment of molten steel by dendrites in a 3D space of at least 0.1&#xa0;mm. This results in obstructed flow, confirming the “bridging” of dendrites in three-dimensional space, resulting in a tendency for central segregation. Dense and dispersed tiny dendrites, under the influence of heat flow direction, interconnect and continuously grow, gradually forming primary and secondary dendrites in three-dimensional space. After the completion of dendritic solidification and growth, these microdendrites appear dense and dispersed on the two-dimensional plane, providing the nuclei for the formation of new dendrites. When reduction occurs at a solid fraction of 0.46, there is a noticeable decrease in dendritic spacing, resulting in improved central segregation.</p>

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Influence of heavy reduction during solidification process of billets based on 3D reconstruction of dendrites

  • 期刊论文

  • 发表日期：

    2025年2月25日

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  • Yi Nian,
  • You-cheng Zong,
  • Chao-jie Zhang,
  • Xin-yu Tang,
  • Jia-le Li,
  • Li-qiang Zhang

摘要

The impact of heavy reduction on dendritic morphology was explored by combining experimental research and numerical simulation in metallurgy, including a detailed three-dimensional (3D) analysis and reconstruction of dendritic solidification structures. Combining scanning electron microscopy and energy-dispersive scanning analysis and ANSYS simulation, the high-precision image processing software Mimics Research was utilized to conduct the extraction of dendritic morphologies. Reverse engineering software NX Imageware was employed for the 3D reconstruction of two-dimensional dendritic morphologies, restoring the dendritic characteristics in three-dimensional space. The results demonstrate that in a two-dimensional plane, dendrites connect with each other to form irregularly shaped “ring-like” structures. These dendrites have a thickness greater than 0.1 mm along the Z-axis direction, leading to the envelopment of molten steel by dendrites in a 3D space of at least 0.1 mm. This results in obstructed flow, confirming the “bridging” of dendrites in three-dimensional space, resulting in a tendency for central segregation. Dense and dispersed tiny dendrites, under the influence of heat flow direction, interconnect and continuously grow, gradually forming primary and secondary dendrites in three-dimensional space. After the completion of dendritic solidification and growth, these microdendrites appear dense and dispersed on the two-dimensional plane, providing the nuclei for the formation of new dendrites. When reduction occurs at a solid fraction of 0.46, there is a noticeable decrease in dendritic spacing, resulting in improved central segregation.