In situ measured growth rates of bainite plates in an Fe-C-Mn-Si superbainitic steel

  • Zhang-wei Hu
  • Guang Xu
  • Hai-jiang Hu
  • Li Wang
  • Zheng-liang Xue
Article

Abstract

The growth rates of bainite plates in an Fe-C-Mn-Si superbainitic steel were investigated by in situ observation. The lengthening rates of ferrite bainite during both cooling and isothermal holding processes were observed and the growth rates of bainite plates nucleating at grain boundaries, within grains and on preformed bainite were measured. It is indicated that the lengthening rates of bainite plates during the cooling and isothermal processes were different, and that the growth rates of bainite plates nucleating at different types of sites also demonstrated diversity. The bainite plates initiating at grain boundaries during cooling grew the fastest, while the plates nucleating on preformed bainite did the slowest. However, the growth rate of the bainite plates nucleating at grain boundaries during isothermal transformation decreased the most, whereas the bainite plates initiating within grains grew the fastest. In addition, the growth rate of ferrite bainite in the study supported the diffusion transformation mechanism of bainite from the viewpoint of growth rate.

Keywords

bainitic steel bainite growth rate cooling isothermal treatment phase transitions 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    M. Chang and H. Yu, Kinetics of bainite-to-austenite transformation during continuous reheating in low carbon microalloyed steel, Int. J. Miner. Metall. Mater., 20(2013), No. 5, p. 427.CrossRefGoogle Scholar
  2. [2]
    Y.Z. Zhu and J.P. Xu, A method to study interface diffusion of arsenic into a Nb-Ti microalloyed low carbon steel, Int. J. Miner. Metall. Mater., 19(2012), No. 9, p. 821.CrossRefGoogle Scholar
  3. [3]
    H. Yada and T. Ooka, On the mechanism of bainite reaction: PT. 1. Investigation of the growth of bainite in Fe-Ni-C alloys by hot stage microscopy, J. Jpn. Inst. Met., 31(1967), p. 766.Google Scholar
  4. [4]
    H. Yada, M. Enomoto, and T. Sonoyama, Lengthening kinetics of bainitic plates in iron-nickel-carbon alloys, ISIJ Int., 35(1995), No. 8, p. 976.CrossRefGoogle Scholar
  5. [5]
    S.J. Matas and R.F. Hehemann, The structure of bainite in hypoeutectoid steels, Trans. Metall. Soc. AIME, 221(1961), p. 179.Google Scholar
  6. [6]
    M. Nemoto, High Voltage Electron Microscopy, Academic Press, New York, 1974, p. 230.Google Scholar
  7. [7]
    D. Quidort and Y.J.M. Brechet, Isothermal growth kinetics of bainite in 0.5% C steels, Acta Mater., 49(2001), No. 20, p. 4161.CrossRefGoogle Scholar
  8. [8]
    R.H. Goodenow, S.J. Matas, and R.F. Hehemann, Growth kinetics and mechanism of bainite transformation, Trans. Metall. Soc. AIME, 227(1963), p. 651.Google Scholar
  9. [9]
    M.M. Rao and P.G. Winchell, Growth rate of bainite from low-carbon iron-nickel-carbon austenite, Trans. Metall. Soc. AIME, 239(1967), p. 956.Google Scholar
  10. [10]
    J.M. Oblak and R.F. Hehemann, Transformations and Hardenability in Steels, Climax Molybdenum Company, Ann Arbor, MI, 1967, p. 15.Google Scholar
  11. [11]
    G.R. Speich and M. Cohen, The growth rate of bainite, Trans. Metall. Soc. AIME, 218(1960), p. 1050.Google Scholar
  12. [12]
    L. Kaufman, S.V. Radcliffe, and M. Cohen, Decomposition of Austenite by Diffusional Processes, John Wiley & Sons, New York, 1962, p. 313.Google Scholar
  13. [13]
    M. Hillert, Diffusion and interface control of reactions in alloys, Metall. Trans. A, 6(1975), No. 1, p. 5.CrossRefGoogle Scholar
  14. [14]
    T. Ko and S.A. Cottrell, The formation of bainite, J. Iron Steel Inst., 172(1952), p. 307.Google Scholar
  15. [15]
    M. Hillert, The role of interfacial energy during solid state phase transformations, Jernkontorets Annaler, 141(1957), p. 757.Google Scholar
  16. [16]
    R. Trivedi, The role of interfacial free energy and interface kinetics during the growth of precipitate plates and needles, Metall. Trans., 1(1970), No. 4, p. 921.Google Scholar
  17. [17]
    M. Enomoto, Thermodynamics and kinetics of the formation of widmanstätten ferrite plates in ferrous alloys, Metall. Mater, Trans. A, 25(1994), No. 9, p. 1947.CrossRefGoogle Scholar
  18. [18]
    T.Y. Hsu, Martensite Transformation and Martensite, Science Press, Beijing, 1980.Google Scholar
  19. [19]
    R.F. Mehl and W.C. Hagel, The austenite: Pearlite reaction, Prog. Met. Phys., 6(1956), p. 74.CrossRefGoogle Scholar

Copyright information

© University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Zhang-wei Hu
    • 1
  • Guang Xu
    • 1
  • Hai-jiang Hu
    • 1
  • Li Wang
    • 2
  • Zheng-liang Xue
    • 1
  1. 1.Key Laboratory for Ferrous Metallurgy and Resources Utilization of the Ministry of EducationWuhan University of Science and TechnologyWuhanChina
  2. 2.State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel Group)ShanghaiChina

Personalised recommendations