Time-resolved Bragg-edge neutron radiography for observing martensitic phase transformation from austenitized super martensitic steel
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  • 作者:Eitan Dabah ; Beate Pfretzschner ; Thomas Schaupp…
  • 刊名:Journal of Materials Science
  • 出版年:2017
  • 出版时间:March 2017
  • 年:2017
  • 卷:52
  • 期:6
  • 页码:3490-3496
  • 全文大小:
  • 刊物类别:Chemistry and Materials Science
  • 刊物主题:Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics;
  • 出版者:Springer US
  • ISSN:1573-4803
  • 卷排序:52
文摘
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 Ms = 190 °C. Using a monochromatic neutron beam with λ = 0.390 nm, the transmitted intensity was significantly reduced during cooling below Ms, 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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