Bragg edge imaging study on microstructure of cast duplex stainless steel

Su, Y. H.  ; Oikawa, Kenichi   ; Kai, Tetsuya   ; Shinohara, Takenao   ; Harada, Masahide   ; Arai, Masatoshi; Shiota, Yoshinori*; Kiyanagi, Yoshiaki*; Sato, Hirotaka*; Tomota, Yo*

Recently, Bragg-edge transmission spectra have been measured using a 2D detector coupled with a pulsed neutron source, which can quantitatively and non-destructively provide 2D-mapping microstructures inside a bulky engineering material. In this study, neutron imaging experiments were performed on a cast duplex stainless steel using NOBORU, BL10 of MLF at J-PARC. Three kinds of 2D detectors on different experimental conditions were tried. As in the figure plotted on the right, two-phase transmission spectra measured by the GEM detector were successfully fitted by a Rietveld type analysis code developed by Sato et al. Crystalline information including lattice constant, projection data of atomic number density, degree of crystallographic anisotropy, crystallite size of each phase were compared from position to position.