A kinetic model of the γ → α + Gr eutectoid transformation in spheroidal graphite cast irons |
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Authors: | Dev Venugopalan |
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Affiliation: | (1) Materials Department, University of Wisconsin-Milwaukee, 53201 Milwaukee, WI |
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Abstract: | The eutectoid transformation of austenite in spheroidal graphite cast iron can follow one of two paths: (a) transformation
to a mixture of ferrite and graphite or (b) transformation to pearlite. The extents to which the two reactions occur determine
the relative amounts of ferrite and pearlite in the microstructure and, hence, the properties of the iron. In this paper,
the kinetics of the γ → α+ Gr reaction is studied, and a model is developed to predict the isothermal transformation rates. The transformation occurs
at a rate determined by the rate of carbon diffusion. The diffusion of carbon through ferrite, as well as through austenite,
has been considered. The model predicts that the volume fraction of austenite transformed isothermally increases with increasing
number density of graphite spheroids. Predictions of the model are compared with data available in literature. |
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