Characterization of Inclusions Formed in Ti-containing Steel Weld Metals

• Seo Kangmyung

  Department of Advanced Materials & Chemical Engineering, Hanyang University

• Kim Young-Min

  Korea Institute of Industrial Technology, Advanced Welding & Joining R&BD Group

• Kim Hee Jin

  Korea Institute of Industrial Technology, Advanced Welding & Joining R&BD Group

• Lee Changhee

  Division of Materials Science and Engineering, Hanyang University

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 ~0.07 wt.% Ti while Mn-depleted zone (MDZ) starts to form at ~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.

Journal

• ISIJ International

  ISIJ International 55 (8), 1730-1738, 2015

  The Iron and Steel Institute of Japan

Keywords

• weld metal
• non-metallic inclusion
• acicular ferrite
• Mn-depleted zone

Details

• CRID: 1390282681464087424
• NII Article ID: 130005096611
• DOI: 10.2355/isijinternational.isijint-2014-800
• ISSN: 13475460
• ISSN: 09151559
• Web Site: https://www.jstage.jst.go.jp/article/isijinternational/55/8/55_ISIJINT-2014-800/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed