Effects of Inclusion Precipitation, Partition Coefficient, and Phase Transition on Microsegregation for High-Sulfur Stee
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idification process of an alloy, the solubility of the solute element in the solid and liquid phases is generally different because the physical and chemical properties between the solid and liquid phases in the solidification system are usually different, leading to the redistribution of solute elements between the solid and liquid phases. As a result, the distribution of the LINTAO GUI, YUNWEI HUANG, HUABIAO CHEN, HUAMEI DUAN, and SHENG YU are with the State Key Laboratory Coal Mine Disaster Dynam & Control, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, People’s Republic of China and also with the Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, People’s Republic of China. MUJUN LONG and DENGFU CHENYU are with the State Key Laboratory Coal Mine Disaster Dynam & Control, College of Materials Science and Engineering, Chongqing University, with the Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, and with the College of Materials Science and Engineering, Chongqing University, Chongqing 400030, People’s Republic of China. Contact e-mail: [email protected] Manuscript submitted April 23, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS B
solute element in the solidification structure of an alloy was uneven. This phenomenon is called solute segregation. Segregation was an inherent property of alloy solidification, which was difficult to eliminate completely. In the actual production process, there were many factors that affected the solute segregation.[1–4] Serious segregation would produce adverse effects on material performance.[5,6] Segregation could be divided into macrosegregation and microsegregation. Macrosegregation refers to the uneven distribution of solute on the macroscopic scale of the material, which could usually be observed by the naked eye.[7] In the process of continuous casting, macrosegregation (central segregation) was usually accompanied by defects such as porosity and cracks, which have a negative effect on the quality of the casting billet. Microsegregation refers to the uneven distribution of solute between the dendrites, which ultimately affected the macrosegregation. The microsegregation model was the fundamental basis for studying solute segregation, which determines the redistribution trend of solute between the solid and liquid phases during alloy solidification.[8] Therefore, the accuracy of the microsegregation model is very important.
Many fundamental microsegregation models were generally developed to study and modify the internal redistribution mechanism of solute elements between the solid and liquid phases, such as the Lever model,[8] the Scheil model,[9] the Brody–Flemings model,[10] the Clyne–Kurz model,[11] the Ohnaka model,[12] the Voller–Beckermann model[13] and the Ueshima model.[14] The fundamental equations, assumptions, and characteristics of these fundamental microsegregation models are shown in Table I. Based on these microsegreg
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