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

DOI: 10.1007/s12613-014-0918-5

Cite this article as:
Hu, Z., Xu, G., Hu, H. et al. Int J Miner Metall Mater (2014) 21: 371. doi:10.1007/s12613-014-0918-5

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 

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

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