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The isothermal austenite-ferrite transformation in some deformed vanadium steels

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Abstract

The effect of vanadium on the isothermal austenite-ferrite transformation, between 725 °C and 775 °C, of a hot-deformed microalloyed steel has been studied by examination of the microstructure and measurement of the volume fraction of ferrite in specimens quenched from the reaction temperature. The accompanying precipitation was studied by transmission electron microscopy of thin foils and carbon extraction replicas and by electron energy-loss spectroscopy. Very early in the transformation a continuous band of fine-grained ferrite forms at austenite grain boundaries. After some time some of these grains coarsen to form large equiaxed ferrite grains. It is found that vanadium has no effect on the time to the start of coarsening but thereafter accelerates the rate of formation of ferrite. Interphase precipitation of VN occurs throughout the transformation in the vanadium steels and this is thought to influence the rate at which the ferrite coarsens at the lower temperatures (750 ° and 725 °C) in the range studied.

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Authors and Affiliations

  1. Homer Research Laboratories, Bethlehem Steel Corporation, 18016, Bethlehem, PA

    M J Crooks

  2. Massachusetts Institute of Technology, 02139, Cambridge, MA

    A J Garratt-Reed (Research Associate), J B Vander Sande (Professor of Materials Science and Engineering) & W S Owen (Department Head and Professor of Materials Science and Engineering)

Authors
  1. M J Crooks
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  2. A J Garratt-Reed
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  3. J B Vander Sande
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  4. W S Owen
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Crooks, M.J., Garratt-Reed, A.J., Sande, J.B.V. et al. The isothermal austenite-ferrite transformation in some deformed vanadium steels. Metall Trans A 13, 1347–1353 (1982). https://doi.org/10.1007/BF02642871

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  • DOI: https://doi.org/10.1007/BF02642871

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