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Influence of deformation on transformation of low-carbon and high Nb-containing steel during continuous cooling

  • Shu-biao Yin
  • Xin-jun Sun
  • Qing-you Liu
  • Zhi-bo Zhang
Article

Abstract

The effect of deformation in the non-recrystallization region on the phase transformation for a low-carbon and high Nb-containing steel with coarse austenite grain size was investigated by means of dilatometric measurement and microstructure observation. The results show that with increasing the cooling rate, both the transformation start and finish temperatures measured by dilatometer are decreased, and the corresponding microstructure is transformed from ferrite and pearlite to full granular bainite gradually. The dynamic continuous cooling transformation diagram was plotted according to the dilatometric measurements and microstructure observations. Dilatometric measurements also show that the transformation start and finish temperatures of the test steel rise with increasing strain, strain rate and deformation temperature, and the reasons are discussed.

Key words

phase transformation Nb non-recrystallization region deformation 

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Copyright information

© China Iron and Steel Research Institute Group 2010

Authors and Affiliations

  • Shu-biao Yin
    • 1
    • 2
  • Xin-jun Sun
    • 2
  • Qing-you Liu
    • 2
  • Zhi-bo Zhang
    • 3
  1. 1.Faculty of Materials and Metallurgical EngineeringKunming University of Science and TechnologyKunming, YunnanChina
  2. 2.Institute for Structural MaterialsCentral Iron and Steel Research InstituteBeijingChina
  3. 3.Technology CenterKunming Iron and Steel Co LtdAnning, YunnanChina

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