NDLI: Oxide Formation Mechanisms in High Manganese Steel Welds

Content Provider	Springer Nature Link
Author	Kim, Dooyoung Han, Kyutae Lee, Bongkeun Han, Ilwook Park, Joo Hyun Lee, Changhee
Copyright Year	2013
Abstract	Oxide inclusions in high-Mn steel welds were analyzed and almost all of which were found to belong to the MnO-Al$_{2}$O$_{3}$-SiO$_{2}$ 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 (MnAl$_{2}$O$_{4}$), tephroite (Mn$_{2}$SiO$_{4}$), 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-SiO$_{2}$-Al$_{2}$O$_{3}$ 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.
Starting Page	2046
Ending Page	2054
Page Count	9
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	45
Issue Number	4
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2013-12-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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