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<p>The heavy section ferritic ductile iron material is prone to graphite degeneracy in the matrix under the influence of cooling rate and Si content, which affects the mechanical properties of the material. In this paper, the Sb element is used to mitigate graphite degeneracy, and the effect of Sb on the microstructure and mechanical properties of heavy section ferritic ductile iron is analyzed in detail. After adding the Sb element, the enrichment of Sb around the graphite effectively inhibits the diffusion of C toward the periphery at the interface, thus making the graphite nodules more spherical. When the Sb content is 0.002%, there are a large number of small and spherical graphite spheres, the tensile strength can reach 453&#xa0;MPa and the elongation is 21.7%. However, excessive Sb will significantly reduce the surface tension at the interface between the iron liquid and the graphite phase and the morphology of the graphite will be damaged, resulting in graphite degeneracy. This study will provide an important research basis and practical experience for the preparation, microstructure and property regulation of heavy section Si solid-solution ferritic ductile iron.</p>

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Preparation of the Heavy Section Ferritic Ductile Iron and Influence of Sb Element

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Shuo Jin,
  • Wei Zhang,
  • Yingdong Qu,
  • Hongkui Zhang,
  • Guangyu Yang,
  • Tingshuai Tan,
  • Guanglong Li

摘要

The heavy section ferritic ductile iron material is prone to graphite degeneracy in the matrix under the influence of cooling rate and Si content, which affects the mechanical properties of the material. In this paper, the Sb element is used to mitigate graphite degeneracy, and the effect of Sb on the microstructure and mechanical properties of heavy section ferritic ductile iron is analyzed in detail. After adding the Sb element, the enrichment of Sb around the graphite effectively inhibits the diffusion of C toward the periphery at the interface, thus making the graphite nodules more spherical. When the Sb content is 0.002%, there are a large number of small and spherical graphite spheres, the tensile strength can reach 453 MPa and the elongation is 21.7%. However, excessive Sb will significantly reduce the surface tension at the interface between the iron liquid and the graphite phase and the morphology of the graphite will be damaged, resulting in graphite degeneracy. This study will provide an important research basis and practical experience for the preparation, microstructure and property regulation of heavy section Si solid-solution ferritic ductile iron.