Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effects of Niobium Microalloying on Microstructure and Properties of Hot-Dip Galvanized Sheet

  • Received : 2009.07.03
  • Accepted : 2010.03.26
  • Published : 2010.04.01
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Abstract

Niobium microalloying is effective in hot-rolled and cold-rolled steels by providing a fine-grained microstructure resulting in increased strength. To optimize the strengthening effect, alloy design and hot-rolling conditions have to be adapted. As a key issue the dissolution and precipitation characteristics of Nb are discussed in particular with regard to the run-out table conditions. It is then considered how the hot-rolled microstructure and the solute state of Nb interact with the hot-dip galvanizing cycle. The adjusted conditions allow controlling the morphology and distribution of phases in the cold-rolled annealed material. Additional precipitation hardening can be achieved as well. The derived options can be readily applied to produce conventional HSLA and IF high strength steels as well as to modern multiphase steels. It will be explained how important application properties such as strength, elongation, bendability, weldability and delayed cracking resistance can be influenced in a controlled and favorable way. Examples of practical relevance and experience are given.

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References

  1. Niobium Science & Technology. Proceedings of the Int. Symp. Niobium 2001, TMS (2001).
  2. C. Klinkenberg, K. Hulka, and W. Bleck, steel research int., 75, 744 (2004). https://doi.org/10.1002/srin.200405837
  3. M.G. Akbcn, I. Weiss, and J.J. Jonas, Acta Metall., 29, 111 (1981). https://doi.org/10.1016/0001-6160(81)90092-4
  4. B. Bacroix, M.G. Akben, and J.J. Jonas, Proc. of the Int. Conf. on Thermomechanical Processing of Microalloyed Austenite p. 293, AIME (1981).
  5. L.J. Cuddy, Proc. of the Int. Conf. on Thermomechanical Processing of Microalloyed Austenite p. 129, AIME (1981).
  6. S. Okaguchi, T. Hashimoto and H. Otani, Proc. of Thermec '88 p. 330, ISIJ (1988).
  7. W. Haensch and C. Klinkenberg, Proc. of 2nd Int. Conf. on Thermomechanical Processing of Steels p. 115, Stahl & Eisen (2004).
  8. J.-L Lee, M.-H. Hon, and G.-H. Cheng, J. Mater. Sci., 22, 2767 (1988).
  9. J. C. Hennan, B. Donnay, and V. Leroy, ISIJ Int., 32, 779 (1992). https://doi.org/10.2355/isijinternational.32.779
  10. D. Horstmann, Arch. Eiscnhunenwesen, 47, 737 (1976).
  11. D.Q. Bai, F. Hamad, J. Asante, and S. Hansen, Proc. of the Int. Conf. on Microalloying for New Steel Processes and Applications, Trans. Tech. Publications, p. 481 (2005).
  12. C.R. Killmore, H.R. Kaul, J.R. Burg, K.R. Carpenter, lG. Williams, D.G. Edelman, P.C. Campbell and W.N. Blejde, Proc. of 3rd Int. Conf. on Thermomechanical Processing of Steels, paper 146, AIM (2008).
  13. W. Bleck, W. Milschenbom, and L. Meyer, steel research int., 59. 344 (1988). https://doi.org/10.1002/srin.198801525
  14. W. Bleck, R. Bode, and F.-J Hahn, Thyssen Technische Berichte, 1/90, 69.
  15. T. Urabe, Y. Ono, T. Fujita, Y. Yamasaki, and Y. Hosoya, Proc. of IntI. Symp. on Niobium Microalloyed Sheet Steel for Automotive Applications, p. 409, TMS (2006).
  16. T. Matsumoto and M. Saito, Proc. of Intl. Symp. on Niobium Microalloyed Sheet Steel for Automotive Applications, p. 427, TMS (2006).
  17. O. Girina. N. Fonstein. and D. Battacharya, Proc. New Developments on Metallurgy and Applicactions of High Strength Steels, paper 13, Buenos Aires (2008).
  18. A. Pichler, T. Hebesberger, S. Traint, E. Tragi, T. Kurz, C. Krempaszky, P. Tsipouridis, and E. Werner, Proc. of IntI. Symp. on Niobium Microalloyed Sheet Steel for Automotive Applications, p. 245, TMS (2006).
  19. S.Hashimoto, Maler. Sci. Forum, 539-543, 4411 (2007).
  20. S. Traint. A. Pichler, R. Sierlinger, H. Pauli, and E. Werner, steel research int., 77, 641 (2006). https://doi.org/10.1002/srin.200606442
  21. H. Mohrbacher, Proc. of Mater. Sci. Tech., p. 1744, Pittsburgh (2008).