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Dissolution Behaviors of Various Carbonaceous Materials in Liquid Iron: Interaction Between Graphite and Iron

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Abstract

The dissolution behaviors of carbon into iron and the interface characteristics were observed by a high-speed CCD camera and a scanning electronic microscope with energy disperse spectroscopy. Samples were obtained from two flexible and simple experiments: (1) the static drop method and (2) the iron cover method. The results show that carbon dissolution occurs when iron is still in solid form, leading to the decrease of the melting point from 1780 K (pure iron) to 1497 K (carburized iron). Carbon dissolved from graphite forms small irregular flake-like structures, then transforms into large-size dendritic crystals by intergrowth with the C added to the iron before heating. Compared with C atoms moving into iron, it is more difficult for Fe atoms to move up into graphite due to the strong repulsive force of the Fe-Fe bond. It is found that the thickness of the Fe-C interface is about 200 μm, which does not change with the initial C content of the iron-carbon alloy.

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Acknowledgements

This work was part of a research project named “The dissolution behavior and carburizing ability of coke dissolution in hot metal” supported by the National Science Foundation of China (51774032); the National Science Foundation for Young Scientists of China (51804025); the National Key Research and Development Program of China (2017YFB0304300 and 2017YFB0304303); the Chinese Fundamental Research Funds for the Central Universities (FRF-TP-17-086A1).

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Correspondence to Ke-Jiang Li or Shan Ren.

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Sun, MM., Zhang, JL., Li, KJ. et al. Dissolution Behaviors of Various Carbonaceous Materials in Liquid Iron: Interaction Between Graphite and Iron. JOM 71, 4305–4310 (2019). https://doi.org/10.1007/s11837-019-03664-9

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  • DOI: https://doi.org/10.1007/s11837-019-03664-9

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