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Oxide Formation Mechanisms in High Manganese Steel Welds

Title
Oxide Formation Mechanisms in High Manganese Steel Welds
Author
이창희
Keywords
SI/MN DEOXIDIZED STEEL; MNS PRECIPITATION; SOLIDIFICATION STRUCTURE; ACICULAR FERRITE; TWIP STEELS; INCLUSIONS; ALLOY; NUCLEATION; PARTICLES
Issue Date
2014-04
Publisher
Springer
Citation
Metallurgical and Materials Transactions A, 2014, 45(4), P.2046-2054
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 (TM) (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.
URI
https://link.springer.com/article/10.1007%2Fs11661-013-2132-x
ISSN
1073-5623; 1543-1940
DOI
10.1007/s11661-013-2132-x
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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