Simulation on scrap melting behavior and carbon diffusion under natural convection

Ming Gao; Jin-tao Gao; Yan-ling Zhang; Shu-feng Yang

doi:10.1007/s12613-020-1997-0

Volume 28 Issue 3

Mar. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(3): 380-389

Ming Gao, Jin-tao Gao, Yan-ling Zhang, and Shu-feng Yang, Simulation on scrap melting behavior and carbon diffusion under natural convection, Int. J. Miner. Metall. Mater., 28(2021), No. 3, pp. 380-389. https://doi.org/10.1007/s12613-020-1997-0

Cite this article as:

Ming Gao, Jin-tao Gao, Yan-ling Zhang, and Shu-feng Yang, Simulation on scrap melting behavior and carbon diffusion under natural convection, Int. J. Miner. Metall. Mater., 28(2021), No. 3, pp. 380-389. https://doi.org/10.1007/s12613-020-1997-0

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Research Article

Simulation on scrap melting behavior and carbon diffusion under natural convection

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Corresponding author:
Yan-ling Zhang E-mail: zhangyanling@metall.ustb.edu.cn
Received: 21 November 2019; Revised: 31 January 2020; Accepted: 2 February 2020; Available online: 11 February 2020

Abstract

Abstract

A 3D model applying temperature- and carbon concentration- dependent material properties was developed to describe the scrap melting behavior and carbon diffusion under natural convection. Simulated results agreed reasonably well with experimental ones. Scrap melting was subdivided into four stages: formation of a solidified layer, rapid melting of the solidified layer, carburization, and carburization + normal melting. The carburization stage could not be ignored at low temperature because the carburization time for the sample investigated was 214 s at 1573 K compared to 12 s at 1723 K. The thickness of the boundary layer with significant concentration difference at 1573 K increased from 130 μm at 5 s to 140 μm at 60 s. The maximum velocity caused by natural convection decreased from 0.029 m·s⁻¹ at 5 s to 0.009 m·s⁻¹ at 634 s because the differences in temperature and density between the molten metal and scrap decreased with time.
- scrap melting;
- natural convection;
- carbon diffusion;
- numerical simulation;
- electron probe micro-analyzer

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References

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