Numerical Analysis of Interfacial Heat Transfer Coefficient During Large Steel Ingot Solidification

doi:10.13228/j.boyuan.issn1001-0963.20130232

Journal of Iron and Steel Research ›› 2014, Vol. 26 ›› Issue (8) : 29-36. DOI: 10.13228/j.boyuan.issn1001-0963.20130232

LAN Peng^1,2,ZHANG Jia-quan^1,2

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Abstract

A 3D FEM solidification model with heat, flow and stress coupled calculation during large steel ingot casting was developed based on viscoelastic-plastic constitutive equations. The heat flux, gap width and interfacial heat transfer coefficient variation as functions of solidification time and location of 8. 5t steel ingot were studied. The results show that the heat flux and heat transfer coefficient decrease dramatically at the very beginning. And those at the corner are the most serious. At the early stage, the heat flux and interfacial heat transfer coefficient on the wide face are both larger than that at the narrow face. However, this difference is observed to be much smaller at the middle and final stage. An inverse calculation model of interfacial heat transfer coefficient against solidification time and temperature has been built up. The simulation temperatures of ingot and mould are very close to the measured and the coupled model′s. The heat transfer coefficient as a function of temperature can be extended to simulate steel ingot solidification with a weight range from 3 to 30t. The solidification time and temperature variation are more coherent with the practical.

Key words

steel ingot / interfacial heat transfer coefficient / inverse model / numerical simulation

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LAN Peng,,ZHANG Jia-quan,. Numerical Analysis of Interfacial Heat Transfer Coefficient During Large Steel Ingot Solidification[J]. Journal of Iron and Steel Research, 2014, 26(8): 29-36 https://doi.org/10.13228/j.boyuan.issn1001-0963.20130232

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