ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Relation between Inclusion Surface and Acicular Ferrite in Low Carbon Low Alloy Steel Weld
Tomonori YamadaHidenori TerasakiYu-ichi Komizo
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2009 Volume 49 Issue 7 Pages 1059-1062


The inclusion of low carbon submerged arc weld metals of a Ti–B system with different aluminum contents has been studied. The inclusions contributing to acicular ferrite nucleation were multi-phase consisting of MnS, MnAl2O4 and amorphous phases. In the energy dispersive X-ray spectroscopy mapping analysis, inclusions were surrounded by a titanium-rich layer. This layer was analysed as Ti–O by energy disperse X-ray spectroscopy spectrum from the interface between inclusion and ferrite. The selected area diffraction pattern of inclusion surface was characterized as TiO. The acicular ferrite had Baker–Nutting orientation relationship with this TiO layer on the inclusions surface, and the lattice misfit was 3.0%. Therefore, it was supposed that the narrow TiO on the inclusion surface promotes acicular ferrite nucleation supplying low interface energy.

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© 2009 by The Iron and Steel Institute of Japan
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