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Time-resolved Bragg-edge neutron radiography for observing martensitic phase transformation from austenitized super martensitic steel

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Abstract

Neutron Bragg-edge imaging was applied for the visualization of a γ-austenite to α′-martensite phase transformation. In the present study, a super martensitic stainless steel sample was heated until complete austenitization and was subsequently cooled down to room temperature. The martensitic phase transformation started at M s = 190 °C. Using a monochromatic neutron beam with λ = 0.390 nm, the transmitted intensity was significantly reduced during cooling below M s, since the emerging martensitic phase has a higher attenuation coefficient than the austenitic phase at this wavelength. The phase transformation process was visualized by filming the transmission images from a scintillator screen with a CCD camera with a temporal resolution of 30 s and a spatial resolution of 100 µm.

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Acknowledgements

The authors thank Helmholtz-Zentrum Berlin for the allocation of neutron radiation beam time.

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Authors and Affiliations

  1. Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205, Berlin, Germany

    Eitan Dabah, Beate Pfretzschner, Thomas Schaupp & Axel Griesche

  2. Helmholtz-Zentrum-Berlin für Materialien und Energie (HZB), Hahn-Meitner-Platz 1, 14109, Berlin, Germany

    Nikolay Kardjilov, Ingo Manke & Mirko Boin

  3. European Spallation Source (ESS) ERIC, Box 176, 22100, Lund, Sweden

    Robin Woracek

Authors
  1. Eitan Dabah
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  2. Beate Pfretzschner
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  3. Thomas Schaupp
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  4. Nikolay Kardjilov
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  5. Ingo Manke
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  6. Mirko Boin
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  7. Robin Woracek
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  8. Axel Griesche
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Correspondence to Beate Pfretzschner.

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Dabah, E., Pfretzschner, B., Schaupp, T. et al. Time-resolved Bragg-edge neutron radiography for observing martensitic phase transformation from austenitized super martensitic steel. J Mater Sci 52, 3490–3496 (2017). https://doi.org/10.1007/s10853-016-0642-9

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  • DOI: https://doi.org/10.1007/s10853-016-0642-9

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