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The production of ultrafine ferrite during hot torsion testing of a 0.11 wt pct C steel

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Abstract

Ultrafine ferrite grain sizes were produced in a 0.11C-1.6Mn-0.2Si steel by torsion testing isothermally at 675 °C after air cooling from 1250 °C. The ferrite was observed to form intragranularly beyond a von Mises equivalent tensile strain of approximately 0.7 to 0.8 and the number fraction of intragranular ferrite grains continued to increase as the strain level increased. Ferrite nucleated to form parallel and closely spaced linear arrays or “rafts” of many discrete ultrafine ferrite grains. It is shown that ferrite nucleates during deformation on defects developed within the austenite parallel to the macroscopic shear direction (i.e., dynamic strain-induced transformation). A model austenitic Ni-30Fe alloy was used to study the substructure developed in the austenite under similar test conditions as that used to induce intragranular ferrite in the steel. It is shown that the most prevalent features developed during testing are microbands. It is proposed that high-energy jogged regions surrounding intersecting microbands provide potential sites for ferrite nucleation at lower strains, while at higher strains, the walls of the microbands may also act as nucleation sites.

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Author notes

  1. P. J. Hurley (formerly Postgraduate Student, Postdoctorate Research Associate)

    Present address: the School of Physics and Materials Engineering, Monash University, 3800, Melbourne, Australia

Authors and Affiliations

  1. Manchester Materials Science Centre, UMIST and University of Manchester, M1 7HS, Manchester, United Kingdom

    P. J. Hurley (formerly Postgraduate Student, Postdoctorate Research Associate)

  2. the School of Physics and Materials Engineering, Monash University, 3800, Melbourne, Australia

    B. C. Muddle (Head of Department)

  3. the School of Engineering and Technology, Deakin University, 3217, Geelong, Australia

    P. D. Hodgson (Head of Department)

Authors
  1. P. J. Hurley
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  2. B. C. Muddle
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  3. P. D. Hodgson
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Hurley, P.J., Muddle, B.C. & Hodgson, P.D. The production of ultrafine ferrite during hot torsion testing of a 0.11 wt pct C steel. Metall Mater Trans A 33, 2985–2993 (2002). https://doi.org/10.1007/s11661-002-0283-2

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  • DOI: https://doi.org/10.1007/s11661-002-0283-2

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