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Analyses of Transformation Kinetics of Carbide-Free Bainite Above and Below the Athermal Martensite-Start Temperature

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Abstract

The isothermal transformation kinetics of austenite decomposition in Fe-0.4C-2.78Mn-1.81Si was analyzed by an electrical resistivity technique in the temperature interval 723 K to 418 K (450 °C to 145 °C). The analysis of transformation kinetics of the bainite transformation was performed using the Johnson–Mehl–Avrami–Kolgomorov (JMAK) and Austin–Rickett (AR) approaches. The kinetic parameters, the reaction constant n, rate constant k = k(T), and apparent activation energy Q were evaluated for isothermal transformations below and above the martensite-start temperature M S  = 548 K (275 °C), which was determined experimentally. The formation of strain-induced martensite, which starts to accompany the bainite transformation at just above M S , increases the rate of transformation and decreases the apparent activation energy of austenite decomposition.

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Notes

  1. This term is in current use within the metallurgical community; it refers to a structure that is similar to true bainite, but which contains no carbides.

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Acknowledgments

This research was supported by the Natural Sciences and Engineering Research Council of Canada. The authors are grateful to Drs. M. Niewczas and J. Britten for access to the ER equipment and for the XRD measurements, respectively.

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Author notes

  1. I. A. Yakubtsov (Research Associate, R&D Scientist)

    Present address: Integrity Testing Laboratory Inc., Toronto, ON, Canada

Authors and Affiliations

  1. Department of Materials Science and Engineering, McMaster University, Hamilton, ON, Canada, L8S 4L7

    I. A. Yakubtsov (Research Associate, R&D Scientist) & G. R. Purdy (University Professor)

Authors
  1. I. A. Yakubtsov
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  2. G. R. Purdy
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Correspondence to I. A. Yakubtsov.

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Manuscript submitted January 13, 2011.

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Yakubtsov, I.A., Purdy, G.R. Analyses of Transformation Kinetics of Carbide-Free Bainite Above and Below the Athermal Martensite-Start Temperature. Metall Mater Trans A 43, 437–446 (2012). https://doi.org/10.1007/s11661-011-0911-9

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