Metals and Materials International

, Volume 24, Issue 3, pp 525–531 | Cite as

Isothermal Treatment Effects on Precipitates and Tensile Properties of an HSLA Steel

  • J.-E. Kim
  • J.-B. Seol
  • W.-M. Choi
  • B.-J. Lee
  • C.-G. Park


The relationships between tensile properties and precipitates of a high-strength low-alloy steel depending on the isothermal conditions were investigated. While the isothermally treated steel at 300–500 °C for 1 and 24 h had no significant difference, the steel treated at 500 for 336 h, denoted as 500–336 h, not only showed a decrease in tensile stress but also exhibited a highly increased elongation. Transmission electron microscopy and atom probe tomography were utilized to evaluate the precipitates distribution. The results showed that, in the case of 500–336 h sample, the fraction of precipitates with a radius over 10 nm is the highest and that of a few nano-sized precipitates is the lowest among all samples. It can be explained that the coarsening of originally nano-sized precipitates, occurred by diffusion of dissolved carbon in 500–336 h, mainly affects the tensile behavior.


Metals Rolling Precipitation Tensile test Transmission electron microscopy (TEM) 



The authors gratefully acknowledge the financial support from POSCO and the National Institute for Nanomaterials Technology (NINT), Korea.


  1. 1.
    Y. Funakawa, T. Shiozaki, K. Tomita, T. Yamamoto, E. Maeda, ISIJ Int. 44(11), 1945 (2004)CrossRefGoogle Scholar
  2. 2.
    K.B. Kang, O. Kwon, W.B. Lee, C.G. Park, Scr. Mater. 36, 1303 (1997)CrossRefGoogle Scholar
  3. 3.
    H. Ohtska, M. Umemoto, I. Tamura, in Proceednigs of International Conference on Thermec, vol 88, Tokyo, Japan (1988), p. 352Google Scholar
  4. 4.
    A. Bakkaloglu, Mater. Lett. 56, 263 (2002)CrossRefGoogle Scholar
  5. 5.
    X. Wang, A. Zhao, Z. Zhao, Y. Huang, Z. Geng, Y. Yu, J. Iron. Steel Res. Int. 21(12), 1140 (2014)CrossRefGoogle Scholar
  6. 6.
    T. Inoue, S. Kinoshita, J. Jpn. Technol. Plast. 14(147), 291 (1973)Google Scholar
  7. 7.
    J.B. Seol, S.H. Na, B. Gault, J.E. Kim, J.C. Han, C.G. Park, D. Raabe, Sci. Rep. 7, 42547 (2017). CrossRefGoogle Scholar
  8. 8.
    X. Wang, H. Di, G. Wang, X. Liu, J. Iron. Steel Res. Int. 19(6), 64 (2012)CrossRefGoogle Scholar
  9. 9.
    Y. Shen, C. Wang, X. Sun, Mater. Sci. Eng. A 528, 8150 (2011)CrossRefGoogle Scholar
  10. 10.
    W. Yan, L. Zhu, W. Sha, Y. Shan, K. Yang, Mater. Sci. Eng. A 517, 369 (2009)CrossRefGoogle Scholar
  11. 11.
    J.M. Hyde, E.A. Marquis, K.B. Wilford, T.J. Williams, Ultramicroscopy 111, 440 (2011)CrossRefGoogle Scholar
  12. 12.
    H.W. Yen, P.Y. Chen, C.Y. Huang, J.R. Yang, Acta Mater. 59, 6264 (2011)CrossRefGoogle Scholar
  13. 13.
    H.W. Yen, C.Y. Huang, J.R. Yang, Adv. Mater. Res. 663, 89 (2009)Google Scholar
  14. 14.
    M.Y. Chen, M. Goune, M. Verdier, Y. Brechet, J.R. Yang, Acta Mater. 64, 78 (2014)CrossRefGoogle Scholar
  15. 15.
    B.G. Baker, J. Nutting, J. Precipit, Process Steels Spec. Rep. 64, 1 (1959)Google Scholar
  16. 16.
    Z.W. Zhang, C.T. Liu, Y.R. Wen, A. Hirata, S. Guo, G. Chen, M.W. Chen, B.A. Chin, Metall. Mater. Trans. A 43, 351 (2012)CrossRefGoogle Scholar
  17. 17.
    Z.W. Zhang, C.T. Liu, S. Guo, J.L. Cheng, G. Chen, T. Fujita, M.W. Chen, Y.W. Chung, S. Vaynman, M.E. Fine, B.A. Chin, Mater. Sci. Eng. A 528, 855 (2011)CrossRefGoogle Scholar
  18. 18.
    M.K. Miller, K.F. Russell, J. Nucl. Mater. 371, 145 (2007)CrossRefGoogle Scholar
  19. 19.
    W. Yan, L. Zhu, W. Sha, Y.Y. Shan, K. Yang, Mater. Sci. Eng. A 517, 369 (2009)CrossRefGoogle Scholar
  20. 20.
    F.B. Pickering, Physical Metallurgy of Microalloyed Steel (Applied Science Publishers, Londen, 1978), p. 63Google Scholar
  21. 21.
    A.J.E. Foreman, M.J. Makin, Can. J. Phys. 45, 511 (1967)CrossRefGoogle Scholar
  22. 22.
    N. Matsuzu, A. Itami, K. Koyama, SAE Technical Paper Series No. 910513Google Scholar

Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  • J.-E. Kim
    • 1
  • J.-B. Seol
    • 2
  • W.-M. Choi
    • 1
  • B.-J. Lee
    • 1
  • C.-G. Park
    • 1
    • 2
  1. 1.Department of Materials Science and EngineeringPOSTECHPohangRepublic of Korea
  2. 2.National Institute for Nanomaterials TechnologyPOSTECHPohangRepublic of Korea

Personalised recommendations