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Investigation of Strain Heterogeneities Between Grains in Ferritic and Ferritic-Martensitic Steels

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Abstract

This work uses microlithography, digital image correlation and tensile test in order to investigate the reasons behind the heterogeneous strain distribution at the grain scale. Scanning Electron Microscope images are taken to examine the relationship between microstructure features and strain heterogeneity. The study is carried out on single phase ferritic steel and two dual phase steels with ferrite and different hard particle martensite contents. Useful image correlation is obtained in grains with diameters of 2–3 μm for the martensite and ranging from 10 to 20 μm for the ferrite. To prevent a decrease of image correlation success, some technical aspects as the microgrid step and bar width are extensively tackled with for intermediate deformations (>10 %). The different levels of longitudinal intragranular strains observed inside the ferrite grains are not correlated with their orientation, shape, size or the presence (and content) of hard phase in the material.

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Acknowledgment

The authors are grateful to R. Chiron for his help in SEM analysis as well as to Dr. P.E. Mazeran for his contribution in nanoindentation tests. The authors would also like to thank H.-S. Tran for his valuable help in microlithography.

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  1. J. Marteau & S. Bouvier

    Present address: Laboratoire Roberval, Université de Technologie de Compiègne, Centre de Recherches de Royallieu, BP 20529—60205, Compiègne Cedex, France

Authors and Affiliations

  1. LSPM-CNRS, UPR3407, University Paris 13, 99 av. J.B. Clément, 93430, Villetaneuse, France

    J. Marteau, H. Haddadi & S. Bouvier

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Marteau, J., Haddadi, H. & Bouvier, S. Investigation of Strain Heterogeneities Between Grains in Ferritic and Ferritic-Martensitic Steels. Exp Mech 53, 427–439 (2013). https://doi.org/10.1007/s11340-012-9657-6

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  • DOI: https://doi.org/10.1007/s11340-012-9657-6

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