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<p>There are serious central segregation and crack defects during the solidification process of continuous casting billets. These defects seriously affect the quality of billets and the service life of products and cannot be completely eliminated in the subsequent processing. In this paper, relevant data on the solidification and reduction processes of steel ingots were obtained by combining physical simulation and ANSYS numerical simulation, and the influence of the interaction between stress, strain, and central segregation on the formation of central cracks under different reduction amounts and solid fraction conditions was analyzed. The results show that the formation of central cracks during the solidification process is due to the fact that the central segregation reduces the plasticity and toughness of the microstructure of the steel ingot, and the uneven heat dissipation increases the thermal stress and strain in the central part. Under the combined action of segregation and thermal stress and strain, central cracks are formed. The formation of central cracks during the reduction process is due to the excessive reduction amount, which leads to the increase of the equivalent stress and strain in the central part of the steel ingot. When the equivalent stress and strain in the central part of the steel ingot exceed the critical stress and strain values for the generation of central cracks, central cracks are generated. Under the condition of a solid fraction of 0.46 and a deformation rate of 4.3&#xa0;pct, the formation of central cracks can be effectively inhibited. This is because under the action of external forces, the dendrites in the central part of the steel ingot are broken, the molten steel flows again, which promotes homogeneous nucleation and improves C segregation, can effectively enhance the uniformity of the microstructure and the plasticity and toughness in the central part of the steel ingot, and inhibits the formation of central cracks.</p>

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Investigation of the Mechanism of Central Crack Formation During the Solidification and Reduction Process of GCr15 Bearing Steel

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Yi Nian,
  • Xin-yu Tang,
  • You-cheng Zong,
  • Shao-wei Hu,
  • Chao-jie Zhang,
  • Hai-chuan Wang,
  • Li-qiang Zhang

摘要

There are serious central segregation and crack defects during the solidification process of continuous casting billets. These defects seriously affect the quality of billets and the service life of products and cannot be completely eliminated in the subsequent processing. In this paper, relevant data on the solidification and reduction processes of steel ingots were obtained by combining physical simulation and ANSYS numerical simulation, and the influence of the interaction between stress, strain, and central segregation on the formation of central cracks under different reduction amounts and solid fraction conditions was analyzed. The results show that the formation of central cracks during the solidification process is due to the fact that the central segregation reduces the plasticity and toughness of the microstructure of the steel ingot, and the uneven heat dissipation increases the thermal stress and strain in the central part. Under the combined action of segregation and thermal stress and strain, central cracks are formed. The formation of central cracks during the reduction process is due to the excessive reduction amount, which leads to the increase of the equivalent stress and strain in the central part of the steel ingot. When the equivalent stress and strain in the central part of the steel ingot exceed the critical stress and strain values for the generation of central cracks, central cracks are generated. Under the condition of a solid fraction of 0.46 and a deformation rate of 4.3 pct, the formation of central cracks can be effectively inhibited. This is because under the action of external forces, the dendrites in the central part of the steel ingot are broken, the molten steel flows again, which promotes homogeneous nucleation and improves C segregation, can effectively enhance the uniformity of the microstructure and the plasticity and toughness in the central part of the steel ingot, and inhibits the formation of central cracks.