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Fast Granularization of Lath-Like Bainite in FeNiC Alloys During Isothermal Holding at Ms+ 20 K (+20 °C)

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Abstract

A fast «granularization» of lath-like bainite is observed in an Fe5Ni0.13C (wt pct) alloy during isothermal holding at Ms+ 20 K (+20 °C). The microstructure evolution with holding time is characterized by Scanning Electron Microscopy and Electron BackScatter Diffraction. Granularization starts once the bainitic transformation is finished and degrades the mechanical properties. The granularization involves a rapid decrease in 60 deg 〈111〉 misoriented bainite laths to a dislocated granular bainite, followed by a slower dislocation rearrangement to sub-grain boundaries and more random boundaries. During the granularization, the carbides go through a ripening process.

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This work was supported by the French State through the program “Investment in the future” operated by the National Research Agency (ANR) and referenced by ANR-11-LABX-0008-01 (LabEx DAMAS) and was also supported by the Region Lorraine. The authors would like to thank Professor Martin Crimp for fruitful discussion.

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Authors and Affiliations

  1. Institut Jean Lamour UMR CNRS 7198, Université de Lorraine, Nancy, France

    Meriem Ben Haj Slama & Sébastien Allain

  2. Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), UMR CNRS 7239, Université de Lorraine, 57045, Metz, France

    Meriem Ben Haj Slama, Nathalie Gey & Lionel Germain

  3. Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (DAMAS), Université de Lorraine, Nancy, France

    Meriem Ben Haj Slama, Nathalie Gey, Lionel Germain & Sébastien Allain

  4. Ecole des Mines de Nancy, Campus Artem - CS 14 234, 54 042, Nancy Cedex, France

    Sébastien Allain

  5. ArcelorMittal Research Center Maizières Research SA, Voie Romaine, BP30320, 57283, Maizières-lès-Metz Cedex, France

    Jean Christophe Hell & Kangying Zhu

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  1. Meriem Ben Haj Slama
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  2. Nathalie Gey
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  3. Lionel Germain
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  4. Jean Christophe Hell
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  5. Kangying Zhu
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  6. Sébastien Allain
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Correspondence to Meriem Ben Haj Slama.

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Manuscript submitted February 13, 2015.

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Ben Haj Slama, M., Gey, N., Germain, L. et al. Fast Granularization of Lath-Like Bainite in FeNiC Alloys During Isothermal Holding at Ms+ 20 K (+20 °C). Metall Mater Trans A 47, 15–18 (2016). https://doi.org/10.1007/s11661-015-3209-5

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  • DOI: https://doi.org/10.1007/s11661-015-3209-5

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