Microstructure evolution in grey cast iron during directional solidification

Xian-fei Ding; Xiao-zheng Li; Qiang Feng; Warkentin Matthias; Shi-yao Huang

doi:10.1007/s12613-017-1474-6

Volume 24 Issue 8

Aug. 2017

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International Journal of Minerals, Metallurgy and Materials > 2017 > 24(8): 884-890. > DOI: 10.1007/s12613-017-1474-6

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://dx.doi.org/10.1007/s12613-017-1474-6

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Microstructure evolution in grey cast iron during directional solidification

Xian-fei Ding^1,2), ,,
Xiao-zheng Li³⁾,
Qiang Feng^2,3),
Warkentin Matthias⁴⁾ and
Shi-yao Huang⁵⁾

Author Affilications

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

Received: 01 March 2017; Revised: 21 March 2017; Accepted: 23 March 2017;

Graphical Abstract

Abstract

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.
- directional solidification,
- grey cast iron,
- phase transition,
- graphite

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References (17)

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