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Precipitation of Nb in Ferrite After Austenite Conditioning. Part I: Microstructural Characterization

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Abstract

While the role of Nb during the processing of austenite is quite clear, what happens in subsequent stages to the concentration of this element left in solution is subject to some debate. In particular, some uncertainty still subsists concerning the eventual homogeneous precipitation in Nb supersaturated polygonal ferrite. The present work was aimed at clarifying the precipitation sequence of Nb during coiling, through a systematic work and a careful selection of the processing conditions in order to produce different scenarios concerning the initial state of Nb. A Nb-microalloyed steel was thermomechanically processed in the laboratory followed by simulated coiling at different temperatures in the 873 K to 1023 K (600 °C to 750 °C) range. Transmission electron microscopy (TEM) showed interphase precipitation of NbC at high coiling temperatures, while at 873 K (600 °C), homogeneous general precipitation took place in ferrite and followed a Baker–Nutting orientation relationship.

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Notes

  1. NORDLYS is a registered trademark of Oxford Instrument PLC., Abingdon, Oxfordshire, Great Britain.

  2. OXFORD HKL CHANNEL 5 PREMIUM is a registered trademark of Oxford Instrument PLC., Abingdon, Oxfordshire, Great Britain.

  3. PHILIPS is a trademark of FEI Company, Hillsboro, OR.

  4. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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Author notes

  1. M. A. Altuna (Researcher, Metallurgy Engineer)

    Present address: Grupo WEC, Polígono Industrial no 38, 20829, Itziar Deba, Basque, Spain

Authors and Affiliations

  1. Materials Department, CEIT and Tecnun (University of Navarra), 20018, Donostia-San Sebastián, Basque, Spain

    A. Iza-Mendia (Researcher), M. A. Altuna (Researcher, Metallurgy Engineer), B. Pereda (Researcher) & I. Gutiérrez (Senior Researcher)

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  1. A. Iza-Mendia
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  2. M. A. Altuna
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Correspondence to A. Iza-Mendia.

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Manuscript submitted October 10, 2011.

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Iza-Mendia, A., Altuna, M.A., Pereda, B. et al. Precipitation of Nb in Ferrite After Austenite Conditioning. Part I: Microstructural Characterization. Metall Mater Trans A 43, 4553–4570 (2012). https://doi.org/10.1007/s11661-012-1395-y

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