PF-LBM Modelling of Dendritic Growth and Motion in an Undercooled Melt of Fe-C Binary Alloy
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rved solidification structure in the metal. During the solidification process of metallic alloy, nucleation occurs at a certain undercooling and subsequently dendritic grain grows. As the dendritic grain continues to grow, the liquid phase gradually changes to the solid phase, and due to the lower solubility of alloy element in solid phase, the solute usually rejects from the solid phase into liquid phase, which can result in the solute concentration
SEN LUO, WEILING WANG, and MIAOYONG ZHU are with the Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University, Shenyang, 110819, Liaoning, P.R. China and with the State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, Liaoning, P.R. China and also with the School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, P.R. China. Contact e-mail: [email protected] PENG WANG is with the Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University and also with the School of Metallurgy, Northeastern University. Contact e-mail: [email protected] Manuscript submitted February 21, 2020.
METALLURGICAL AND MATERIALS TRANSACTIONS B
fluctuation on different scales. Generally, the solute segregation on the scale of dendrite is named as microsegregation, and the solute segregation on the scale of entire product is named as macrosegregation. Macrosegregation is far more difficult to reduce by the subsequently thermo-mechanical post-treatments, and thus it is one of the most concerned issues in the cast melts. Many researchers[1–4] have approved that the interaction of dendritic growth, fluid flow, dendritic motion and solute diffusion has a great effect on the macrosegregation of cast melts. Therefore, the fundamental knowledge of the dendritic growth and motion is of a great importance to control the macrosegregation of cast melts, and has attracted lots of concentrations from the researchers and metallurgists. As we know, the solidification process of metal is a high temperature and opaque, and it is difficult to directly observe the solidification phenomenon that occurs inside the cast metal. In the last decade, the X-ray imaging using the synchrotron radiation X-ray[5–7] has been widely adopted to observe the solidification phenomena of metallic alloys with low melting points, such as: Sn, Zn and Al alloys, due to the absorption contrast induced by the solid/liquid interface, solute distribution and precipitated phases.
Because of the low absorption contrast between solid and liquid phases in high melting temperature, it was rarely used to investigate the solidification phenomena of iron alloy until Yasuda et al.[6,7] developed an improved X-ray imaging technique for observing solidification phenomena of pure Fe and carbon steels. Although it is possible to in-situ observe the solidification phenomena in metallic alloys with high melting temperature, the burden and cost for the in-situ experiment using the synchrotron radiation X-ray is
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