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Volume 24 Issue 8
Aug.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(8): 884-890
Xian-fei Ding, Xiao-zheng Li, Qiang Feng, Warkentin Matthias, and Shi-yao Huang, Microstructure evolution in grey cast iron during directional solidification, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 884-890. https://doi.org/10.1007/s12613-017-1474-6
Cite this article as:
Xian-fei Ding, Xiao-zheng Li, Qiang Feng, Warkentin Matthias, and Shi-yao Huang, Microstructure evolution in grey cast iron during directional solidification, Int. J. Miner. Metall. Mater., 24(2017), No. 8, pp. 884-890. https://doi.org/10.1007/s12613-017-1474-6
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研究论文Open Access

Microstructure evolution in grey cast iron during directional solidification

  • National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China

  • Beijing Key Laboratory of Special Melting and Preparation of High-end Metal, University of Science and Technology Beijing, Beijing 100083, China

  • State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

  • Ford Research & Advanced Engineering Europe, AA-FFA-1, Süsterfeldstr. 200 Aachen, 52072, Germany

  • Materials and Process Research, Ford Motor Research and Engineering Center, Nanjing 211100, China

  • 通讯作者:

    Xian-fei Ding    E-mail: xfding@ustb.edu.cn

  • The solidification characteristics and microstructure evolution in grey cast iron were investigated through Jmat-Pro simulations and quenching performed during directional solidification. The phase transition sequence of grey cast iron was determined as L → L + γ → L +γ + G → γ + G → P (α + Fe3C) + α + G. The graphite can be formed in three ways:directly nucleated from liquid through the eutectic reaction (L → γ + G), independently precipitated from the oversaturated γ phase (γ → γ + G), and produced via the eutectoid transformation (γ → G + α). The area fraction and length of graphite as well as the primary dendrite spacing decrease with increasing cooling rate. Type-A graphite is formed at a low cooling rate, whereas a high cooling rate results in the precipitation of type-D graphite. After analyzing the graphite precipitation in the as-cast and transition regions separately solidified with and without inoculation, we concluded that, induced by the inoculant addition, the location of graphite precipitation changes from mainly the γ interdendritic region to the entire γ matrix. It suggests that inoculation mainly acts on graphite precipitation in the γ matrix, not in the liquid or at the solid-liquid front.
    • Research ArticleOpen Access

    Microstructure evolution in grey cast iron during directional solidification

    + Author Affiliations
      Abstract
    • The solidification characteristics and microstructure evolution in grey cast iron were investigated through Jmat-Pro simulations and quenching performed during directional solidification. The phase transition sequence of grey cast iron was determined as L → L + γ → L +γ + G → γ + G → P (α + Fe3C) + α + G. The graphite can be formed in three ways:directly nucleated from liquid through the eutectic reaction (L → γ + G), independently precipitated from the oversaturated γ phase (γ → γ + G), and produced via the eutectoid transformation (γ → G + α). The area fraction and length of graphite as well as the primary dendrite spacing decrease with increasing cooling rate. Type-A graphite is formed at a low cooling rate, whereas a high cooling rate results in the precipitation of type-D graphite. After analyzing the graphite precipitation in the as-cast and transition regions separately solidified with and without inoculation, we concluded that, induced by the inoculant addition, the location of graphite precipitation changes from mainly the γ interdendritic region to the entire γ matrix. It suggests that inoculation mainly acts on graphite precipitation in the γ matrix, not in the liquid or at the solid-liquid front.
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