Investigation of bainite formation in a chemically inhomogeneous medium carbon steel

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Abstract

The effect of chemical inhomogeneity on the isothermal bainite formation is investigated in medium-carbon low-silicon spring steel by dilatometry and microscopy. The analysis of the microstructure at different times during transformation shows that chemical segregation of substitutional alloying elements resulting from casting strongly affects the bainite formation by retarding the transformation kinetics and limiting the maximum achievable bainite fraction. The effect of prior austenite grain size and Cr-rich carbide precipitation in the segregation bands is investigated and compared with the findings in homogenized material. A physically based model is used to simulate bainite formation and the mechanisms of nucleation and growth are discussed. The calculated difference in nucleation rates between the enriched and the depleted areas is not by itself sufficient to explain the microstructures obtained and thus significant influence variations of growth on bainite formation is involved, which indicates that a diffusional transformation is taking place.

Original languageEnglish
Title of host publicationPTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
EditorsL-Q Chen et al
PublisherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
Pages71-72
ISBN (Electronic)9780692437360
Publication statusPublished - 2015
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015 - Whistler, Canada
Duration: 28 Jun 20153 Jul 2015

Conference

ConferenceInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015
Abbreviated titlePTM 2015
CountryCanada
CityWhistler
Period28/06/153/07/15

Keywords

  • Bainite
  • Kinetics
  • Segregation

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  • Cite this

    Goulas, K., Mecozzi, M. G., & Sietsma, J. (2015). Investigation of bainite formation in a chemically inhomogeneous medium carbon steel. In L-Q. Chen et al (Ed.), PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015 (pp. 71-72). International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015.