Abstract
A duplex stainless steel composed of 23% ferrite and austenite has been aged at 593 K. A change in the mean internal magnetic field of Fe in ferrite has been confirmed by Mössbauer spectroscopy with increasing aging time. The result is attributed to the compositional change owing to the phase decomposition of ferrite. A mottled structure characteristic of the spinodal decomposition was observed by TEM at the aging time of 180 ks(50 h). After aging 360 ks(100 h), precipitates were observed as black spot in the bright field images of TEM. The precipitate is interpreted as Cr-rich phase by HAADF-STEM observation. The volume fraction of the Cr-rich phase has been measured as a function of aging time by Mössbauer spectroscopy and TEM observation. Both result showed a fairly well agreement with each other. The decomposition fraction of ferrite y is expressed by a sigmoidal function, y=1-exp (-ktn) where n=0.67.
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