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Development of ferrite/bainite bands and study of bainite transformation retardation in HSLA steel during continuous cooling

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Abstract

The development of banded structure in HSLA steel during continuous cooling has been systematically studied using dilatometry and microstructural observations. At low cooling rates (<10 °C/min), the microstructure contains alternating bands of ferrite and a mixture of pearlite and bainite. At higher cooling rate (>10 °C/min), the formation of pearlite is suppressed, and the corresponding microstructure consists of banded ferrite and bainite. Dilatometric analysis indicates that as ferrite and pearlite transformation at low rates (or ferrite transformation at higher rates) completes, Manganese (Mn) and Carbon (C) concentration in austenite can retard the bainitic transformation and result in the transformation stagnancy phenomenon. The magnitude of retardation and the bainite morphology are affected by Mn and C concentration. The increased cooling rate decreases Mn and C content in bainite, and then the length of the stagnant stage decreases and bainite morphology changes from lower bainite to acicular ferrite.

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Authors and Affiliations

  1. State Key Lab of Hydraulic Engineering Simulation and Safety, School of Material Science and Engineering, Tianjin University, Tianjin, 300072, PR China

    Lei Shi, Zesheng Yan, Yongchang Liu, Xu Yang & Huijun Li

  2. School of Mechanical Engineering, Tianjin University of Commerce, Tianjin, 300134, PR China

    Zhixia Qiao

  3. School of Materials Science and Engineering, Tianjin University of Technology, Tianjin, 300384, PR China

    Baoqun Ning

Authors
  1. Lei Shi
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  2. Zesheng Yan
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  3. Yongchang Liu
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  4. Xu Yang
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  5. Zhixia Qiao
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  6. Baoqun Ning
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  7. Huijun Li
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Correspondence to Yongchang Liu.

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Shi, L., Yan, Z., Liu, Y. et al. Development of ferrite/bainite bands and study of bainite transformation retardation in HSLA steel during continuous cooling. Met. Mater. Int. 20, 19–25 (2014). https://doi.org/10.1007/s12540-014-1006-0

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  • DOI: https://doi.org/10.1007/s12540-014-1006-0

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