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01-12-2016 | Original Paper

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

Authors: Eitan Dabah, Beate Pfretzschner, Thomas Schaupp, Nikolay Kardjilov, Ingo Manke, Mirko Boin, Robin Woracek, Axel Griesche

Published in: Journal of Materials Science | Issue 6/2017

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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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Title: Time-resolved Bragg-edge neutron radiography for observing martensitic phase transformation from austenitized super martensitic steel
Authors: Eitan Dabah
Beate Pfretzschner
Thomas Schaupp
Nikolay Kardjilov
Ingo Manke
Mirko Boin
Robin Woracek
Axel Griesche
Publication date: 01-12-2016
Publisher: Springer US
Published in: Journal of Materials Science / Issue 6/2017
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-016-0642-9

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