Abstract
The relations between the migration of the δ/γ interface boundary and the growth of austenite as a function of aging treatment in SAF 2205 duplex stainless steel were investigated in the present study. The migration of the δ/γ interface boundary into the ferrite phase region resulted from the nucleation and growth of M23C6 carbides with patterns of “lamellar” and “larva”, having a cube–cube orientation relationship with the austenite. The growth of secondary austenite, which is mainly induced by chromium depletion arising from carbide and σ phase formation, has occurred in of three different ways; (i) the coupled lamellar growth, (ii) only austenite growth leaving “larva” typed carbides and (iii) the bulged austenite between the σ phases.
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