Science in China Series E: Technological Sciences

, Volume 41, Issue 6, pp 666–669 | Cite as

TEM study of transformation units and the growth mechanism of bainite

  • Rong Shen
  • Juqiang Cheng
  • Mokuang Kang


The morphologies and substructures of bainites formed in Fe-Ni-Mn and Cu-Zn-Al alloys have been studied by TEM. The existence of bainitic transformation units is observed. The lengthening of bainitic plate is processed by the strain induced nucleation of the units. The thickening direction is determined along the defect planes. The formation of ledges is due to the different transverse size of those subunits or the displacement of bainitic plate. The ledges correspond to defect planes and cannot move laterally.


bainite transformation unit ledge 


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  1. 1.
    Oblack, J. M., Hehamann, R. F.,Transformation and Hardenability in Steels, Ann Arbor: Climax Molybdenum Company, 1967, 15.Google Scholar
  2. 2.
    Bhadeshia, H. K. D. H., Edmonds, D. V., The mechanism of bainite formation in steels,Acta Metall., 1980, 28 (9): 1265.CrossRefGoogle Scholar
  3. 3.
    Yu, D. G., Chen, D. J., Zheng, J. H. et al., Phase transformation unit of bainitic ferrite and its surface relief in low and medium carbon alloy steels,Acta Metall. Sin. (in Chinese), 1988, 24(6): A379.Google Scholar
  4. 4.
    Li, C. M., Fang, H. S., Zheng, Y. K. et al., Subunits and their sympathetic nucleation-ledgewise growth of bainite in a Cu-Zn-Al alloy,Acta Metall. Sin. (in Chinese), 1996, 32(1): 1.MATHGoogle Scholar
  5. 5.
    Li, F. Z., Ao, Q., Gu, Y. N. et al., TEM observation of the fine structure of bainite.Acta Metall. Sin. (in Chinese), 1997, 33(3): 241.Google Scholar
  6. 6.
    Aaronson, H. I.,Decomp. Aust. by Diffu. Proc., New York: Inter. Publ., 1962, 387.Google Scholar
  7. 7.
    Rigsbee, J. M., Aaronson, H. I., A computer modeling study of partially coherent F. C. C. boundaries,Acta Metall., 1979, 27: 365.CrossRefGoogle Scholar
  8. 8.
    Fang, H. S., Li, C. M., Wang, J. J., Initial α1 plates and three-dimensional ledges of bainite in a Cu-Zn-al alloy,Acta Metal. Sin., 1993, 29(9): A383.Google Scholar
  9. 9.
    Bhadeshia, H. K. D. H., Christian, J. W., Bainite in steels,Metall. Trans. A, 1990, 21(4): 767.Google Scholar
  10. 10.
    Yu, D. G., Zhu, Y. R., Chen, D. J., et al., Bainitic transformation units and formation of martensite-like bainite in Fe-C alloys,Acta Metall. Sin. (in Chinese), 1994, 30(9): 385.Google Scholar
  11. 11.
    Meng, X. K., Kang, M. K., The formation mechanism of plate in beta Cu-Zn and Cu-Zn-Al alloys,Metall. Mater. Trans. A, 1994, 25: 2601.CrossRefGoogle Scholar
  12. 12.
    Wu, X. L., Chen, G. N., Kang, M. K., TEM study of growth mechanism at the initial stage of bainitic reaction in steels,Trans. Metal Heat Treat. (in Chinese), 1997, 18(2): 14.Google Scholar

Copyright information

© Science in China Press 1998

Authors and Affiliations

  • Rong Shen
    • 1
  • Juqiang Cheng
    • 1
  • Mokuang Kang
    • 1
  1. 1.Department of Materials Science and Engineering 401Northwestern Polytechnical UniversityXi'anChina

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