Investigation of bainite formation in a chemically inhomogeneous medium carbon steel

C. Goulas; M. G. Mecozzi; J. Sietsma

Investigation of bainite formation in a chemically inhomogeneous medium carbon steel

C. Goulas, M. G. Mecozzi, J. Sietsma

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

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 language	English
Title of host publication	PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
Editors	Long-Qing Chen, Matthias Militzer, Gianluigi Botton, James Howe, Chadwick Sinclair, Hatem Zurob
Publisher	International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015
Pages	71-72
Number of pages	2
ISBN (Electronic)	9780692437360
Publication status	Published - 2015
Externally published	Yes
Event	International Conference on Solid-Solid Phase Transformations in Inorganic Materials, PTM 2015 - Whistler, Canada Duration: 28 Jun 2015 → 3 Jul 2015

Conference

Conference	International Conference on Solid-Solid Phase Transformations in Inorganic Materials, PTM 2015
Abbreviated title	PTM 2015
Country/Territory	Canada
City	Whistler
Period	28/06/15 → 3/07/15

Keywords

Bainite
Kinetics
Segregation

Cite this

Goulas, C., Mecozzi, M. G., & Sietsma, J. (2015). Investigation of bainite formation in a chemically inhomogeneous medium carbon steel. In L.-Q. Chen, M. Militzer, G. Botton, J. Howe, C. Sinclair, & H. Zurob (Eds.), 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.

Goulas, C. ; Mecozzi, M. G. ; Sietsma, J. / Investigation of bainite formation in a chemically inhomogeneous medium carbon steel. PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015. editor / Long-Qing Chen ; Matthias Militzer ; Gianluigi Botton ; James Howe ; Chadwick Sinclair ; Hatem Zurob. International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, 2015. pp. 71-72

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title = "Investigation of bainite formation in a chemically inhomogeneous medium carbon steel",

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.",

keywords = "Bainite, Kinetics, Segregation",

author = "C. Goulas and Mecozzi, {M. G.} and J. Sietsma",

year = "2015",

language = "English",

pages = "71--72",

editor = "Long-Qing Chen and Matthias Militzer and Gianluigi Botton and James Howe and Chadwick Sinclair and Hatem Zurob",

booktitle = "PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015",

publisher = "International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015",

note = "International Conference on Solid-Solid Phase Transformations in Inorganic Materials, PTM 2015, PTM 2015 ; Conference date: 28-06-2015 Through 03-07-2015",

}

Goulas, C, Mecozzi, MG & Sietsma, J 2015, Investigation of bainite formation in a chemically inhomogeneous medium carbon steel. in L-Q Chen, M Militzer, G Botton, J Howe, C Sinclair & H Zurob (eds), PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015. International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, pp. 71-72, International Conference on Solid-Solid Phase Transformations in Inorganic Materials, PTM 2015, Whistler, British Columbia, Canada, 28/06/15.

Investigation of bainite formation in a chemically inhomogeneous medium carbon steel. / Goulas, C.; Mecozzi, M. G.; Sietsma, J.
PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015. ed. / Long-Qing Chen; Matthias Militzer; Gianluigi Botton; James Howe; Chadwick Sinclair; Hatem Zurob. International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, 2015. p. 71-72.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

TY - GEN

T1 - Investigation of bainite formation in a chemically inhomogeneous medium carbon steel

AU - Goulas, C.

AU - Mecozzi, M. G.

AU - Sietsma, J.

PY - 2015

Y1 - 2015

N2 - 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.

AB - 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.

KW - Bainite

KW - Kinetics

KW - Segregation

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M3 - Conference contribution

AN - SCOPUS:84962777086

SP - 71

EP - 72

BT - PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015

A2 - Chen, Long-Qing

A2 - Militzer, Matthias

A2 - Botton, Gianluigi

A2 - Howe, James

A2 - Sinclair, Chadwick

A2 - Zurob, Hatem

PB - International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015

T2 - International Conference on Solid-Solid Phase Transformations in Inorganic Materials, PTM 2015

Y2 - 28 June 2015 through 3 July 2015

ER -

Goulas C, Mecozzi MG, Sietsma J. Investigation of bainite formation in a chemically inhomogeneous medium carbon steel. In Chen LQ, Militzer M, Botton G, Howe J, Sinclair C, Zurob H, editors, PTM 2015 - Proceedings of the International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015. International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015. 2015. p. 71-72

Investigation of bainite formation in a chemically inhomogeneous medium carbon steel

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