Dabah, E.; Pfretzschner, B.; Schaupp, T.; Kardjilov, N.; Manke, I.; Boin, M.; Woracek, R.; Griesche, A.: Time-resolved Bragg-edge neutron radiography for observing martensitic phase transformation from austenitized super martensitic steel. Journal of Materials Science 52 (2017), p. 3490–3496
10.1007/s10853-016-0642-9
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 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.