Abstract
To accurately simulate the formation of macrosegregation, a major defect commonly encountered in large ingots, solidification researchers have developed various mathematical models and conducted corresponding steel ingot dissection experiments for validation. A multicomponent and multiphase solidification model was utilized to predict macrosegregation of steel ingots in this research. The model described the multi-phase flow phenomenon during solidification, with the feature of strong coupling among mass, momentum, energy, and species conservation equations. Impact factors as thermo-solutal buoyancy flow, grains sedimentation, and shrinkage-induced flow on the macroscopic scale were taken into consideration. Additionally, the interfacial concentration constraint relations were derived to close the model by solving the solidification paths in the multicomponent alloy system. A finite-volume method was employed to solve the governing equations of the model. In particular, a multi-phase SIMPLEC (semi-implicit method for pressure-linked equations-consistent) algorithm was utilized to solve the velocity-pressure coupling for the specific multiphase flow system. Finally, the model was applied to simulate the macrosegregation in a 535 tons steel ingot. The simulated results were compared with the experimental results and the predictions reproduced the classical macrosegregation patterns. Good agreement is shown generally in quantitative comparisons between experimental results and numerical predictions of carbon, chromium and molybdenum concentration. It is demonstrated that the multicomponent-multiphase solidification model can well predict macrosegregation in steel ingots and help optimize the ingot production process.
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References
E.J. Pickering, Macrosegregation in steel ingots: the applicability of modelling and characterisation techniques. ISIJ Int. 53(6), 935–949 (2013)
C. Beckermann, Modelling of macrosegregation: applications and future needs. Int. Mater. Rev. 47(5), 243–261 (2002)
M.C. Flemings, G.E. Nereo, Macrosegregation: part I. Trans. Metall. Soc. AIME 239(9), 1449–1461 (1967)
J. Ni, C. Beckermann, A volume-averaged two-phase model for transport phenomena during solidification. Metall. Trans. B 22(3), 349–361 (1991)
M. Wu, A. Ludwig, A three-phase model for mixed columnar-equiaxed solidification. Metallur. Mater. Trans. A 37(5), 1613–1631 (2006)
I. Vannier, H. Combeau, G. Lesoult, Numerical model for prediction of the final segregation pattern of bearing steel ingots. Mater. Sci. Eng. A 173(1–2), 317–321 (1993)
D.R. Liu et al., Numerical simulation of macrosegregation in large multiconcentration poured steel ingot. Int. J. Cast Met. Res. 23(6), 354–363 (2010)
W.T. Tu et al., Three-dimensional simulation of macrosegregation in a 36-ton steel ingot using a multicomponent multiphase model. JOM 68(12), 3116–3125 (2016)
W.S. Li, H.F. Shen, B.C. Liu, Numerical simulation of macrosegregation in steel ingots using a two-phase model. Int. J. Miner., Metallur. Mater. 19(9), 787–794 (2012)
H. Combeau et al., Prediction of macrosegregation in steel ingots: influence of the motion and the morphology of equiaxed grains. Metallur. Mater. Trans. B 40(3), 289–304 (2009)
L. Thuinet, H. Combeau, Prediction of macrosegregation during the solidification involving a peritectic transformation for multicomponent steels. J. Mater. Sci. 39(24), 7213–7219 (2003)
W.S. Li, Numerical simulation of macrosegregation in large steel ingots based on two-phase model. Ph.D. thesis, Tsinghua University, 2012, pp. 59–103
M.C. Schneider, C. Beckermann, Formation of macrosegregation by multicomponent thermosolutal convection during the solidification of steel. Metallur. Mater. Trans. A 9(26), 2373–2388 (1995)
Acknowledgements
This work was financially supported by the NSFC-Liaoning Joint Fund (U1508215) and the project to strengthen industrial development at the grass-roots level of MIIT China (TC160A310/21).
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Chen, K., Tu, W., Shen, H. (2017). Numerical Simulation of Macrosegregation in a 535 Tons Steel Ingot with a Multicomponent-Multiphase Model. In: Mason, P., et al. Proceedings of the 4th World Congress on Integrated Computational Materials Engineering (ICME 2017). The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-57864-4_18
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DOI: https://doi.org/10.1007/978-3-319-57864-4_18
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