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Effect of titanium content on weld microstructure and mechanical properties of bainitic GMA welds

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Abstract

The effects of titanium content on the weld microstructure, mechanical properties, and inclusion characteristics were investigated in the as-deposited bainitic GMA weld metals having nearly constant level of oxygen content. It was found that titanium addition enhanced the formation of acicular ferrite with the maximum proportion being obtained at ∼0.07 wt% Ti. The resultant change in weld microstructure with titanium content was well reflected in the Charpy impact toughness showing the lowest ductile-brittle transition temperature at 0.07 wt% Ti. Detailed TEM and STEM analysis preformed on weld metal inclusions demonstrated that the maximum acicular ferrite recorded in this weld is mainly attributable to the formation of manganese-depleted zone (MDZ) associating with the formation of nonmetallic inclusions dominant with Ti2O3 phase.

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Acknowledgments

The authors would like to thank Dr. G. M. Evans for his valuable suggestions and continuous supports for this study. This work has been financially supported by KITECH.

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Authors and Affiliations

  1. Technical Research Center, Hyundai Steel Co., 167-32, Kodaeri Songakeup, Dangjinsi, 343-823, Republic of Korea

    Jun Seok Seo

  2. Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Republic of Korea

    Kangmyung Seo & Changhee Lee

  3. Korea Institute of Industrial Technology, 35-3 Hongchonri, Ibjangmyun, Chonansi, 330-825, Republic of Korea

    Hee Jin Kim

Authors
  1. Jun Seok Seo
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  2. Kangmyung Seo
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  3. Hee Jin Kim
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  4. Changhee Lee
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Corresponding author

Correspondence to Hee Jin Kim.

Additional information

Doc. IIW-2483, recommended for publication by Commission IX “Behaviour of Metals Subjected to Welding”.

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Seo, J.S., Seo, K., Kim, H.J. et al. Effect of titanium content on weld microstructure and mechanical properties of bainitic GMA welds. Weld World 58, 893–901 (2014). https://doi.org/10.1007/s40194-014-0168-1

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  • DOI: https://doi.org/10.1007/s40194-014-0168-1

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