Thermodynamics of Acicular Ferrite Formation
G. I. Rees and H. K. D. H. Bhadeshia
Abstract
The thermodynamic driving force necessary to stimulate the
nucleation of acicular ferrite and bainite is investigated for
a series of high strength weld metals, using a combination of
dilatometry, scanning electron microscopy, and thermodynamic
calculations. The results indicate that the nucleation of
acicular ferrite and bainite can be represented by the same
thermodynamic model. It therefore appears that the nucleation
mechanism of acicular ferrite on non-metallic inclusions in
weld metals is essentially similar to that of bainite at the
austenite grain boundaries. Metallographic observations confirm
the notion that acicular ferrite is essentially intragranularly
nucleated bainite.
MATERIALS SCIENCE AND TECHNOLOGY, 1994, Vol.10, No.5, pp.353-
358.
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