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Characterization of Inclusions Formed in Ti-containing Steel Weld Metals

Title
Characterization of Inclusions Formed in Ti-containing Steel Weld Metals
Author
이창희
Keywords
weld metal; non-metallic inclusion; acicular ferrite; Mn-depleted zone
Issue Date
2015-08
Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
Citation
ISIJ INTERNATIONAL, v. 55, NO 8, Page. 1730-1738
Abstract
The influence of Ti addition on inclusion characteristics and their effects on the nucleation of acicular ferrite has been studied using as-deposited bainitic-type GMA weld metals prepared with oxygen content constant. TEM analysis was carried out to identify the inclusion phases and to investigate the local variation in chemical composition around the inclusions. It was found that the Ti-containing phase changes from (Mn,Ti)-spinel oxide to Ti2O3 at similar to 0.07 wt.% Ti while Mn-depleted zone (MDZ) starts to form at similar to 0.02 wt.% Ti. This indicates that MDZs are induced by the formation of Ti2O3 as well as a large amount of (Mn,Ti)-spinel oxide. Due to MDZ formation, acicular ferrite can nucleate to a great extent, even from the amorphous surface of the Mn-silicate phase in the 0.02% Ti weld.
URI
https://www.jstage.jst.go.jp/article/isijinternational/55/8/55_ISIJINT-2014-800/_articlehttp://hdl.handle.net/20.500.11754/26680
ISSN
0915-1559; 1347-5460
DOI
10.2355/isijinternational.ISIJINT-2014-800
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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