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Bainite Transformation During Continuous Cooling: Analysis of Dilatation Data

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Abstract

A new approach based on iteration is presented to extract the amount and composition of bainitic ferrite and austenite from the dilatation curve. The carbon concentration of bainitic ferrite estimated from the dilatation curve was found to be higher than the solubility of carbon in α-ferrite that is in paraequilibrium with γ-austenite, and it agreed well with the corresponding value estimated from X-ray diffraction (XRD). A slightly better fit between the experimental and calculated dilatation curves was obtained with body-centered-tetragonal than with body-centered-cubic (bcc) bainitic ferrite. These results suggest that the austenite to bainitic ferrite transformation occurs through a displacive mechanism.

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Acknowledgments

The authors gratefully acknowledge the Head of the Department of Metallurgical and Materials Engineering, Indian Institute of Technology (Kharagpur, India), for providing the laboratory facility. The authors also thank the Ministry of Steel and Department of Science and Technology, Government of India, for the partial financial support.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India

    Ravi Ranjan & Shiv Brat Singh

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  1. Ravi Ranjan
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  2. Shiv Brat Singh
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Correspondence to Ravi Ranjan.

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Manuscript submitted 16 August, 2017.

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Ranjan, R., Singh, S.B. Bainite Transformation During Continuous Cooling: Analysis of Dilatation Data. Metall Mater Trans A 49, 88–93 (2018). https://doi.org/10.1007/s11661-017-4419-9

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  • DOI: https://doi.org/10.1007/s11661-017-4419-9

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