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Effect of Rb2O and Cs2O on Inclusion Removal in 321 Stainless Steels Using Novel Basic Tundish Fluxes

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Abstract

Inclusion removal and modification of the 321 stainless steel using Rb2O- and Cs2O-containing novel basic tundish flux has been investigated. The average inclusion diameter was significantly lowered after reaction of the liquid metal with the flux after 45 minutes in an induction furnace set at 1823 K (1550 °C) under an Ar atmosphere. The number of inclusions was also decreased with increased reaction time and the majority of the inherent TiN inclusions were removed after reaction with the proposed novel basic tundish flux. Spinel inclusions were also observed after the reaction, which was due to the reaction of the MgO crucible and the CaO-Al2O3-SiO2-MgO-‘x’wt pct R2O flux system at fixed CaO/(Al2O3 + SiO2) of 1.45. The Rb2O and Cs2O seemed to have allowed significant removal of the TiN inclusions due to its ion compensation effect and the supplement of free oxygen ions, while increasing the viscosity of the slag to retain the absorbed inclusions.

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This study was partially supported by the Brain Korea 21 PLUS (BK21 PLUS) Project at the Division of the Eco-Humantronics Information Materials and the National Research Foundation of Korea Grant (2013R1A1A2009967).

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Author notes

  1. Il Sohn (Associate Professor)

    Present address: Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Japan

Authors and Affiliations

  1. Department of Materials Science and Engineering, Yonsei University, Seoul, 120-749, Korea

    Kyunsuk Choi (Graduate Student) & Il Sohn (Associate Professor)

  2. Department of Materials Science and Engineering, Dong-A University, Busan, 640-714, Korea

    Youngjo Kang (Assistant Professor)

Authors
  1. Kyunsuk Choi
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  2. Youngjo Kang
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  3. Il Sohn
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Correspondence to Il Sohn.

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Manuscript submitted May 3, 2015.

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Choi, K., Kang, Y. & Sohn, I. Effect of Rb2O and Cs2O on Inclusion Removal in 321 Stainless Steels Using Novel Basic Tundish Fluxes. Metall Mater Trans B 47, 1520–1526 (2016). https://doi.org/10.1007/s11663-016-0604-2

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  • DOI: https://doi.org/10.1007/s11663-016-0604-2

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