Simulation on scrap melting behavior and carbon diffusion under natural convection
来源期刊：International Journal of Minerals Metallurgy and Materials2021年第3期
论文作者：Ming Gao Jin-tao Gao Yan-ling Zhang Shu-feng Yang
摘 要：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 at634 s because the differences in temperature and density between the molten metal and scrap decreased with time.
Ming Gao1，Jin-tao Gao1，Yan-ling Zhang1，Shu-feng Yang2
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing
摘 要：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 at634 s because the differences in temperature and density between the molten metal and scrap decreased with time.
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