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<p>Although Cerium is widely utilized to enhance the cleanliness and refine dendritic structure of Ferrium M54 steel, its precise influence mechanism on shrinkage and porosity remains poorly understood. This study quantitatively investigated the effects of Ce addition on the feeding resistance during the formation of porosity in Ferrium M54 ingots. Results indicate that two types of porosity exist in the ingot: net-porosity and island-porosity, and the island porosity is usually located at the edge of the porosity area. Adding Ce exacerbates the formation of porosity defects, causing the effective utilization rate decreases from 72.8 to 65.4 pct with increasing Ce content from 0 to 0.086 pct. This is because the addition of Ce enhances the feeding resistance on molten steel during the formation of porosity. The underlying mechanism is twofold and synergistic: (1) the addition of Ce refines the dendritic structure (decreased SDAS and increased solid fraction), which dramatically increases the probability of dendrite bridging and thus reduces interdendritic permeability; (2) Ce addition increases the solidus-liquidus temperature difference, which effectively widens the mushy zone and prolongs the required feeding channels.</p>

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Mechanistic Study of Ce Addition Increasing Feeding Resistance During Formation of Porosity in Ferrium M54 Ingots

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Zhiyu He,
  • Xinbo Yan,
  • Hongchun Zhu,
  • Huabing Li,
  • Zhuowen Ni,
  • Hao Feng,
  • Shucai Zhang,
  • Zhouhua Jiang,
  • Xiangxiang Shi

摘要

Although Cerium is widely utilized to enhance the cleanliness and refine dendritic structure of Ferrium M54 steel, its precise influence mechanism on shrinkage and porosity remains poorly understood. This study quantitatively investigated the effects of Ce addition on the feeding resistance during the formation of porosity in Ferrium M54 ingots. Results indicate that two types of porosity exist in the ingot: net-porosity and island-porosity, and the island porosity is usually located at the edge of the porosity area. Adding Ce exacerbates the formation of porosity defects, causing the effective utilization rate decreases from 72.8 to 65.4 pct with increasing Ce content from 0 to 0.086 pct. This is because the addition of Ce enhances the feeding resistance on molten steel during the formation of porosity. The underlying mechanism is twofold and synergistic: (1) the addition of Ce refines the dendritic structure (decreased SDAS and increased solid fraction), which dramatically increases the probability of dendrite bridging and thus reduces interdendritic permeability; (2) Ce addition increases the solidus-liquidus temperature difference, which effectively widens the mushy zone and prolongs the required feeding channels.