Abstract
A cast duplex stainless steel practically used in the intermediate temperature range of 280 to 330°C was investigated in terms of its aging behavior in the temperature range of 350 to 450°C for aging times up to 20000 h. A change in ferrite composition with increasing aging time was detected at room temperature by Mösbauer spectroscopy. The characteristic changes in internal magnetic field distribution and its full width at half maximum revealed that the ferrite phase decomposes by the spinodal process. The change in ferrite composition with time during aging was analyzed and the corresponding equation proposed was that of the sum of two hyperbolic tangent curves. The activation energy for the compositional change during decomposition was about 200 kJ/mol, which is comparable to that for volume diffusion of Cr or Fe in ferrite. An aging parameter p(t,T) calculated from the above activation energy was introduced to estimate the decomposition behavior at temperatures lower than 350°C. The time required for the ferrite phase to reach completion of phase decomposition was estimated to be about 1700000 h at 320°C.
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