Ferrite Formation Above the Ae3 in a Medium-Carbon Steel

John J. Jonas; Vladimir V. Basabe

doi:10.4028/www.scientific.net/SSP.172-174.372

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HomeSolid State PhenomenaSolid State Phenomena Vols. 172-174Ferrite Formation Above the Ae3 in a Medium-Carbon...

Ferrite Formation Above the Ae₃ in a Medium-Carbon Steel

Abstract:

A 0.45% C steel was deformed in torsion over the temperature range 762-872°C in a 5%H₂-Argas atmosphere. Strains of 0.25-3.0 were applied at a strain rate of ε^. = 4 s^-1. The experimental parameters were varied in order to study the effects of strain and temperature on the formation of ferrite by dynamic transformation (DT) at temperatures above the Ae₃. The critical strain for ferrite formation by DT was about 0.2 and its volume fraction increased with strain. The average ferrite grain sizes were about 1 to 2 µm and were fairly independent of temperature. It was observed that the deformation-induced ferrite remained fairly stable during 800 s of isothermal holding. In general, the experiments showed that DT takes place at temperatures above the Ae₃ and that the reverse static transformation is much slower than the forward dynamic transformation.

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Periodical:

Solid State Phenomena (Volumes 172-174)

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372-377

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.172-174.372

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Online since:

June 2011

Authors:

John J. Jonas, Vladimir V. Basabe

Keywords:

Deformation-Induced Ferrite, Dynamic Transformation, Grain Size, Hot Rolling

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