Metals and Materials International

, Volume 21, Issue 3, pp 461–469 | Cite as

Improvement of low temperature toughness of ferritic Mn steels by alloy modification

  • Il-Cheol Yi
  • Yumi Ha
  • K. H. Kwon
  • Hakcheol Lee
  • Nack J. Kim
Article
First Online:
Received:
Accepted:

Abstract

A study has been made on the effects of Mn content and addition of Al on the microstructure and mechanical properties of (4-6)Mn steels, with the aim of developing ferritic Mn steels having good combination of tensile properties and impact toughness. It has been shown that the reduction of Mn content to 6 wt% and lower from 8-12 wt% of conventional steels can effectively prevent the occurrence of intergranular fracture, which has been a major problem of (8-12)Mn steels with poor toughness at cryogenic temperature. While increasing Mn content in the binary (4-6)Mn steels results in an increase in strength and a decrease in impact toughness, the addition of 1Al to (4-6)Mn steels results in improvements in both strength and impact toughness as compared to those of the binary (4-6)Mn steels and the best impact toughness has been obtained in the as-rolled 1Al added 4Mn steel, whose microstructure consists of fine acicular ferrite grains.

Keywords

Mn steels impact test toughness microstructure intergranular fracture 
This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    C. Syn, J. W. Morris, and S. Jin, Met. Trans. A 7, 1827 (1976).CrossRefGoogle Scholar
  2. 2.
    M. Hoshino, N. Saitoh, H. Muraoka, and O. Saeki, Nippon Steel Tech. Rep. 90, 20 (2004).Google Scholar
  3. 3.
    X.-Q. Zhao, T. Pan, Q.-F. Wang, H. Su, C.-F. Yang, and Q.- X. Yang, J. Iron Steel Res. Int. 18, 47 (2011).CrossRefGoogle Scholar
  4. 4.
    S. K. Hwang and J. W. Morris, Metall. Trans. A 10, 545 (1979).CrossRefGoogle Scholar
  5. 5.
    K. H. Kwon, B.-C. Suh, S.-I. Baik, Y.-W. Kim, J.-K. Choi, and N. J. Kim, Sci. Technol. Adv. Mater. 14, 014204 (2013).CrossRefGoogle Scholar
  6. 6.
    B. C. Edwards, M. Nasim, and E. A. Wilson, Scripta Metall. 12, 377 (1978).Google Scholar
  7. 7.
    M. Nasim, B. C. Edwards, and E. A. Wilson, Mater. Sci. Eng. A 281, 56 (2000).CrossRefGoogle Scholar
  8. 8.
    C. J. McMahon, A. K. Cianelli, and H. C. Feng, Metall. Trans. A 8, 1055 (1977).CrossRefGoogle Scholar
  9. 9.
    J. B. Rellick and C. J. McMahon, Metall. Trans. A 5, 2439 (1974).CrossRefGoogle Scholar
  10. 10.
    J. P. Coad, J. C. Riviere, M. Guttmann, and P. R. Krahe, Acta Metall. 25, 161 (1977).CrossRefGoogle Scholar
  11. 11.
    G. L. Krasko and G. B. Olson, Solid State Commun. 76, 247 (1990).CrossRefGoogle Scholar
  12. 12.
    J. Kameda and O. Buck, Mater. Sci. Eng. A 83, 29 (1986).CrossRefGoogle Scholar
  13. 13.
    J. Kameda and Y. Nishiyama, Mater. Sci. Eng. A 528, 3705 (2011).CrossRefGoogle Scholar
  14. 14.
    K. H. Kwon, I. C. Yi, Y. Ha, K. K. Um, J. K. Choi, K. Hono, K. Oh-ishi, and N. J. Kim, Scripta Mater. 69, 420 (2013).CrossRefGoogle Scholar
  15. 15.
    M. Niikura and J. W. Morris, Metall. Trans. A 11, 1531 (1980).Google Scholar
  16. 16.
    W. T. Geng, A. J. Freeman, and G. B. Olson, Phys. Rev. B 63, 165415 (2001).CrossRefGoogle Scholar
  17. 17.
    Y. M. Kim, H. Lee, and N. J. Kim, Mater. Sci. Eng. A 478, 361 (2008).CrossRefGoogle Scholar
  18. 18.
    H. Mabuchi and H. Nakao, Transactions ISIJ 21, 495 (1981).CrossRefGoogle Scholar
  19. 19.
    E. I. Rabinovich, M. K. Skul’skii, and K. K. Biktagirov, Met. Sci. Heat Treat. 1, 27 (1959).CrossRefGoogle Scholar
  20. 20.
    S. Kwon, Y.-M. Kong, and J. Park, Met. Mater. Int. 20, 959 (2014).CrossRefGoogle Scholar
  21. 21.
    G. A. Charushnikova, Y. E. Gol’dshtein, and Y. G. Razumov, Met. Sci. Heat Treat. 11, 539 (1969).CrossRefGoogle Scholar
  22. 22.
    A. Zargaran, H. S. Kim, J. H. Kwak, and N. J. Kim, Scripta Mater. 89, 37 (2014).CrossRefGoogle Scholar
  23. 23.
    A. Zargaran, H. S. Kim, J. H. Kwak, and N. J. Kim, Met. Mater. Int. 21, 79 (2015).CrossRefGoogle Scholar

Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Il-Cheol Yi
    • 1
  • Yumi Ha
    • 1
  • K. H. Kwon
    • 2
  • Hakcheol Lee
    • 3
  • Nack J. Kim
    • 1
  1. 1.Graduate Institute of Ferrous TechnologyPOSTECHPohangKorea
  2. 2.Research Institute of Industrial Science and TechnologyPohangKorea
  3. 3.Plate Research Group, Technical Research LaboratoriesPOSCOPohangKorea

Personalised recommendations