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Nucleation Behavior Analysis of Intragranular Acicular Ferrite in a Ti-killed C-Mn Steel

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Abstract

By using a Gleeble 3500D thermo-mechanical simulator, the nucleation behavior of intragranular acicular ferrites (IAF) was studied in a Ti-killed C-Mn steel. During continuous cooling transformation, the allotriomorphic ferrite (AF) and ferrite side plate (FSP) microstructures grew more rapidly with the temperature decreasing from 800 to 650 °C, and the IAF microstructure was dominant within austenite grain with further cooling to 600 °C. The diffusion bonding experiment and the effect of C, Mn and Si concentrations on the Ae3 temperature by thermodynamic calculation confirm that Ti2 O3 itself absorbs neighboring Mn atoms to form Mn-depleted zone (MDZ), which promotes the nucleation of IAF microstructure effectively. High temperature holding tests indicate that the nucleation potential of IAF microstructure was lowered in the Ti-killed C-Mn steel when it was treated at high temperature (1250 °C) for a longer time, which is attributed to the saturated absorption degree of Mn atoms by titanium oxide.

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Authors and Affiliations

  1. Division of Structural Material, Central Iron and Steel Research Institute, Beijing, 100081, China

    Feng Chai (Doctor, Senior Engineer), Hang Su, Cai-fu Yang & Dong-mei Xue

Authors
  1. Feng Chai
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  2. Hang Su
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  3. Cai-fu Yang
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  4. Dong-mei Xue
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Correspondence to Feng Chai.

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Chai, F., Su, H., Yang, Cf. et al. Nucleation Behavior Analysis of Intragranular Acicular Ferrite in a Ti-killed C-Mn Steel. J. Iron Steel Res. Int. 21, 369–374 (2014). https://doi.org/10.1016/S1006-706X(14)60057-1

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60057-1

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