Metallography, Microstructure, and Analysis

, Volume 7, Issue 2, pp 143–152 | Cite as

The Effect of Boron on the Impact Energy of Low-Carbon Steel Weld Metal at Low Temperatures

  • Seyyed Reza Amirabadizade
  • Shamsodin Shafinia
  • Hamed Sabet
  • Shamsodin Mirdamadi
  • Hossein Ebrahimnezhad-Khaljiri
Technical Article

Abstract

In this research, the effect of boron (B) on the impact energy at low temperatures of carbon steel weld metal was investigated. B was added into the flux core weld wire in the form of boron oxide (B2O3). The welding operation was carried out using the submerged arc method on steel plates. After that, the scanning electron microscopy, optical microscopy (OM), microhardness, chemical analysis and impact Charpy test were performed to investigate the B effects. The OM results showed that until 20 ppm B, acicular ferrite in the microstructure was increased, whereas Widmanstatten, polygonal and grain boundary ferrites were decreased. In addition, by increasing B from 20 to 110 ppm, the dominant structure of ferrite was made of Widmanstatten and polygonal ferrites. Microhardness test also showed that the samples containing 20 ppm B had the lowest hardness. Charpy impact test revealed that the sample containing 20 ppm B at three temperatures (25, 0 and – 20 °C) had the best results, whereas in the other samples, by increasing B, a reduction was observed in the value of impact energy. It was also found that the portion of the brittle fracture in the samples containing 20 ppm B (with the highest impact energy) was 10% at the temperature of – 20 °C, whereas this portion in the samples containing 110 ppm B (with the lowest impact energy) was 50%.

Keywords

Carbon steel Boron Weld metal Impact toughness Acicular ferrite 

Notes

Acknowledgements

At the end, the authors appreciate the AMA Industrial Company as their multilateral supporter. It played a major role in conducting this research.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature and ASM International 2018

Authors and Affiliations

  • Seyyed Reza Amirabadizade
    • 1
  • Shamsodin Shafinia
    • 2
  • Hamed Sabet
    • 3
  • Shamsodin Mirdamadi
    • 4
  • Hossein Ebrahimnezhad-Khaljiri
    • 5
  1. 1.Department of Materials Science and Engineering, South Tehran BranchIslamic Azad UniversityTehranIran
  2. 2.Department of Materials Engineering, Science and Research BranchIslamic Azad UniversityTehranIran
  3. 3.Department of Materials Science and Engineering, Karaj BranchIslamic Azad UniversityAlborzIran
  4. 4.Department of Materials Science and EngineeringUniversity of Science and TechnologyTehranIran
  5. 5.Faculty of Materials Science and EngineeringK. N. Toosi University of TechnologyTehranIran

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