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Thermo-Physical Properties of B2O3-Containing Mold Flux for High Carbon Steels in Thin Slab Continuous Casters: Structure, Viscosity, Crystallization, and Wettability

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Abstract

The effect of B2O3 on the thermo-physical properties of commercial mold fluxes, including the viscosity, crystallization behavior, and wettability, was investigated. Viscosity was measured using the rotating spindle method, and CCT (continuous cooling transformation) diagrams were obtained to investigate the crystallization behavior at various cooling rates using CLSM (confocal laser scanning microscope). The wettability of the fluxes was determined by measuring the contact angles at 1573 K (1300 °C) using the digital images generated by the sessile drop method and were used to calculate the surface tension, interfacial tension, and work of adhesion for Flux A (existing flux) and B (modified flux). These thermo-physical properties were correlated with the structural analysis obtained using FT-IR (Fourier transform-infrared), Raman and MAS-NMR (magic angle spin-nuclear magnetic resonance) spectroscopy. In addition, DTA (differential thermal analysis) was performed on the samples to measure the liquidus temperatures. Higher B2O3 concentrations resulted in lower liquidus temperatures, consequently decreasing the viscosity, the break temperature, and the crystallization temperature. However, B2O3 addition accelerated crystal growth owing to the higher diffusion kinetics of the cations, which also reduced the size of the liquid/solid co-existing region.

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Acknowledgments

This study was supported by the Brain Korea 21 PLUS (BK21 PLUS) Project at the Division of the Humantronics Information Materials Grant No. 2014-11-0010 and the National Research Foundation of Korea, Project No. NRF- 2013R1A1A2009967. Special appreciation is extended to professor Takeshi Yoshikawa and senior research engineer Yutaka Yanaba at The University of Tokyo for conducting the NMR experiments and helpful comments on the NMR analysis.

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  1. Materials Science and Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-749, Korea

    Jun-Yong Park (Graduate Student), Gi Hyun Kim (Graduate Student), Jong Bae Kim (Graduate Student), Sewoong Park (Graduate Student) & Il Sohn (Associate Professor)

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  1. Jun-Yong Park
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Manuscript submitted March 1, 2016.

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Park, JY., Kim, G.H., Kim, J.B. et al. Thermo-Physical Properties of B2O3-Containing Mold Flux for High Carbon Steels in Thin Slab Continuous Casters: Structure, Viscosity, Crystallization, and Wettability. Metall Mater Trans B 47, 2582–2594 (2016). https://doi.org/10.1007/s11663-016-0720-z

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