Year

1984

Degree Name

Master of Metallurgy (Hons.)

Department

Department of Metallurgy

Abstract

Transformation of f e r r i t e to austenite and si^ma phase in a duplex f e r r i t i c - a u s t e n i t i c stainless steel containing the equivalent of 25% Cr and 1% Ni was investigated by optical and electron microscopy. The morphologies of the product structures and kinetics of transformation were determined over the temperature range D O 1200 C to 600 C using specimens that had been isothermally treated. The nucleation and difiusional growth of austenite into a Widmanstatten plate morphology was found to occur f i r s t on the f e r r i t i c grain boundaries followed by intergranular precipitation. The kinetics of formation of austenite was determined

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Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.