Microstructure and residual strain distribution in cast duplex stainless steel studied by neutron imaging

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

In this study, neutron imaging experiment was performed using NOBORU, BL10 of MLF at J-PARC. Four kinds of cast duplex stainless steel with ferrite and austenite microstructure were studied here, which were produced by different casting method at different temperature. Firstly, two-dimensional scintillation detector using wavelength-shifting fibers with pixel size of 0.52 mm 0.52 mm and illuminated area 55 mm 55 mm was used for data collection. Then, measurement by Micro Pixel Chamber based neutron imaging detector having higher spatial resolution about 0.2 mm was conducted. Data analysis code RITS (Rietveld Imaging of Transmission Spectra) will be used for microstructure including crystalline phase, lattice strain, crystallite size, texture evaluation.