SpringerLink
Log in

Microstructure and High-Temperature Strength in the Weld Coarse-Grained Heat-Affected Zone of Fire-Resistant Steels and the Effects of Mo and Nb Additions

  • Published:
Metals and Materials International Aims and scope Submit manuscript

Abstract

The microstructural evolution and fire-resistant properties in the weld heat-affected zone (HAZ) of Mo and Mo + Nb-added fire-resistant steels were investigated. For this purpose, three Fe-0.1 wt%C-1.5 wt%Mn-0.1 wt%Si steels containing various Mo and Nb contents were prepared. HAZ samples were experimentally simulated using a Gleeble simulator at a welding heat input of 30 and 300 kJ/cm. The yield strength of the HAZ samples was higher than those of base steels at both room temperature and 600 ℃, whereas a greater decrease in the yield strength at 600 ℃ compared to that at room temperature occurred in the HAZ samples than in the base steels, indicating that the fire-resistance deteriorated in the HAZs as compared to the base steels. This is due to the formation of hard phases such as bainite and martensite in the HAZs, i.e., bainite and martensite phase have very high yield strength with high dislocation density at room temperature, while their strengths decrease rapidly at high temperature due to a great annihilation and recovery of dislocations at high temperature. In addition, the fire-resistance of the HAZ improved as the heat input was increased. The alloying of Mo and Nb improved the fire-resistance of both the base steels and the HAZs. Finally, the changes in the microstructures of the base steels and the HAZs upon alloying and the heat input and corresponding effects on the fire-resistance were carefully explored and discussed through transmission electron microscopy analyses, atom probe tomography analyses, and calculations of continuous cooling transformation diagrams.

Graphical abstract

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Subscribe and save

Springer+ Basic
EUR 32.99 /Month
  • Get 10 units per month
  • Download Article/Chapter or Ebook
  • 1 Unit = 1 Article or 1 Chapter
  • Cancel anytime
Subscribe now

Buy Now

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11

Similar content being viewed by others

Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author upon reasonable request.

References

  1. H.-H. Jo, C. Shin, J. Moon, J.H. Jang, H.-Y. Ha, S.-J. Park, T.-H. Lee, B.H. Lee, J.-H. Chung, J.G. Speer, K.O. Findley, T.R. Jacobs, C.-H. Lee, S.-D. Kim, Mater. Des. 194, 108882 (2020)

    Article  CAS  Google Scholar 

  2. F.S. Kelly, W. Sha, J. Constr. Steel Res. 50, 223 (1999)

    Article  Google Scholar 

  3. R. Wan, F. Sun, L. Zhang, A. Shan, Mater. Des. 35, 335 (2012)

    Article  CAS  Google Scholar 

  4. R. Wan, F. Sun, L. Zhang, A. Shan, Mater. Des. 36, 227 (2012)

    Article  CAS  Google Scholar 

  5. S. Yoshida, T. Okumura, H. Kita, J. Takahashi, K. Ushioda, Mater. Trans. 55, 899 (2014)

    Article  CAS  Google Scholar 

  6. R. Uemori, H. Tamehiro, R. Chijiiwa, Nippon Steel Tech. Rep. 69, 23 (1996)

    Google Scholar 

  7. W.-B. Lee, S.-G. Hong, C.-G. Park, S.-H. Park, Metall. Mater. Trans. A 33, 1689 (2002)

    Article  Google Scholar 

  8. B.R. Kirby, R.R. Preston, Fire Safety J. 13, 27 (1988)

    Article  CAS  Google Scholar 

  9. D. Choi, H. Lee, S.-K. Cho, H.C. Kim, S.-K. Hyun, S.Y. Shin, Met. Mater. Int. 26, 867 (2020)

    Article  CAS  Google Scholar 

  10. H.H. Wang, Z.P. Qin, X.L. Wan, R. Wei, K.M. Wu, D. Misra, Met. Mater. Int. 23, 848 (2017)

    Article  CAS  Google Scholar 

  11. C. Pandey, M.M. Mahapatra, P. Kumar, A. Giri, Met. Mater. Int. 23, 900 (2017)

    Article  CAS  Google Scholar 

  12. J.S. Lee, K. Maruyama, Met. Mater. Int. 21, 639 (2015)

    Article  CAS  Google Scholar 

  13. K. Easterling, Introduction to the Physical Metallurgy of Welding, 1st edn. (Butterworth, London, 1983), pp. 17–26

    Google Scholar 

  14. J. Moon, C.-H. Lee, T.-H. Lee, H.C. Kim, Metall. Mater. Trans. A 46, 156 (2015)

    Article  CAS  Google Scholar 

  15. ASTM A370-19e1, Standard test methods and definitions for mechanical testing of steel products, ASTM (2019)

  16. S. Jeong, B. Kim, J. Moon, S.-J. Park, C. Lee, Mater. Sci. Eng. A 726, 223 (2018)

    Article  CAS  Google Scholar 

  17. H. Mohrbacher, Mo and Nb alloying in plate steels for high-performance applications. in 2011 International Symposium on the Recent Developments in Plate Steels, Winter Park, Colorado, USA (2011), pp. 169–179

Download references

Acknowledgements

This study was supported financially by the Ministry of Trade, Industry & Energy (MOTIE, Korea) (Grant No. 20010453).

Author information

Authors and Affiliations

  1. Steel Department, Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea

    Joonoh Moon, Chang-Hoon Lee, Hyo-Haeng Jo & Sung-Dae Kim

  2. Department of Materials Science and Engineering, Changwon National University, Changwon, 51140, Republic of Korea

    Hyun-Uk Hong

  3. Incheon R&D Team, Hyundai Steel Company, Incheon, 22525, Republic of Korea

    Jun-Ho Chung

  4. Center for Core Research Facilities, Daegu Gyeongbuk Institute of Science and Technology, Daegu, 42988, Republic of Korea

    Bong Ho Lee

Authors
  1. Joonoh Moon
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Chang-Hoon Lee
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Hyo-Haeng Jo
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Sung-Dae Kim
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Hyun-Uk Hong
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. Jun-Ho Chung
    View author publications

    You can also search for this author in PubMed Google Scholar

  7. Bong Ho Lee
    View author publications

    You can also search for this author in PubMed Google Scholar

Contributions

JM analyzed the results and wrote the manuscript. HHJ preformed the microstructure observations and the tensile tests. SDK contributed to the microstructure analyses using TEM. CHL, HUH, and JHC discussed the experimental results and commented on the manuscript. BHL carried out 3D-AP analyses.

Corresponding author

Correspondence to Joonoh Moon.

Ethics declarations

Conflict of Interest

The Authors declare no competing interests.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Moon, J., Lee, CH., Jo, HH. et al. Microstructure and High-Temperature Strength in the Weld Coarse-Grained Heat-Affected Zone of Fire-Resistant Steels and the Effects of Mo and Nb Additions. Met. Mater. Int. 28, 966–974 (2022). https://doi.org/10.1007/s12540-020-00947-8

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s12540-020-00947-8

Keywords

Search

Navigation