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Oxide Formation Mechanisms in High Manganese Steel Welds

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Abstract

Oxide inclusions in high-Mn steel welds were analyzed and almost all of which were found to belong to the MnO-Al2O3-SiO2 system. In this study, the inclusions were categorized based on MnS morphology into the following two types: (1) aluminosilicate with a MnS patch, or (2) aluminosilicate with a MnS shell. The most frequently detected was type 1, the formation mechanism of which was investigated using commercially available thermochemical computing software, FactSage™ (ver. 6.3). The thermodynamic calculations predicted that galaxite (MnAl2O4), tephroite (Mn2SiO4), and MnS could precipitate during solidification. However, because of the fast cooling rate in welding processes, galaxite and tephroite phases were unable to fully crystallize, but rather were supercooled as glassy phases. In order to confirm the validity of the thermodynamic calculations, the composition of the observed inclusions was compared with the MnO-SiO2-Al2O3 ternary phase diagram, resulting in remarkably good agreement. Furthermore, it was found that the type of the oxide inclusions was dependent on their location (i.e., MnS shell- and MnS patch-type oxides were detected at the dendritic core and interdendritic boundary, respectively). Both types of oxides were occasionally found in one oxide, near the interdendritic boundary. This indicates that the morphology variation originates from the redistribution of solute due to fast solidification.

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Acknowledgments

The authors would like to thank to POSCO Technical Research Laboratory for financial support.

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Authors and Affiliations

  1. Department of Materials Science & Engineering, Hanyang University, Seoul, 133-791, Republic of Korea

    Dooyoung Kim (Master Course), Kyutae Han (Ph.D. Candidate) & Changhee Lee (Professor)

  2. POSCO Technical Research Laboratories, Pohang, 790-785, Republic of Korea

    Bongkeun Lee (Research Engineer) & Ilwook Han (Principal Engineer)

  3. Department of Materials Engineering, Hanyang University, Ansan, 426-791, Republic of Korea

    Joo Hyun Park (Professor)

Authors
  1. Dooyoung Kim
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  2. Kyutae Han
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  3. Bongkeun Lee
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  4. Ilwook Han
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  5. Joo Hyun Park
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  6. Changhee Lee
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Correspondence to Changhee Lee.

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Manuscript submitted January 13, 2013.

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Kim, D., Han, K., Lee, B. et al. Oxide Formation Mechanisms in High Manganese Steel Welds. Metall Mater Trans A 45, 2046–2054 (2014). https://doi.org/10.1007/s11661-013-2132-x

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