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Precipitation at Transformation Interfaces

Published online by Cambridge University Press:  15 February 2011

F. A. Khalid and
D. V. Edmonds
F. A. Khalid
Affiliation:
Department of Materials University of Oxford Parks Road Oxford OXI 3PH UK
D. V. Edmonds
Affiliation:
Department of Materials University of Oxford Parks Road Oxford OXI 3PH UK
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Abstract

Alloy carbide precipitation associated with the transformation interface between austenite and ferrite, and austenite and pearlite in steels can result in a fine particle dispersion that can contribute significantly to strength in a wide range of commercial carbon steels. Studies of this precipitation reaction are hindered by the fact that the transformation interface is lost upon cooling to room temperature, either by further transformation or by decomposition of the residual austenite phase to martensite. In the present work this has been avoided by developing an alloy in which the precipitation reaction occurs, but in which the austenite is stabilised to room temperature, thus allowing a detailed examination by TEM and APFIM techniques of the interfacial region.

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