Aspects of the Nucleation of Widmanstatten Ferrite

A. Ali and H. K. D. H. Bhadeshia


Published experimental data on the variation of the highest temperature at which Widmanstatten ferrite can be seen to form at a detectable rate, as a function of steel composition, are analysed theoretically. It is found that the data can be predicted to a fair accuracy if it is assumed that the nucleation of Widmanstatten ferrite occurs by a mechanism which is similar to that of martensite, but with the diffusion of carbon during nucleation, and if it is additionally assumed that the growth of Widmanstatten ferrite can only be sustained when the chemical driving force exceeds a specific stored energy term.

Materials Science and Technology, Vol. 6, 1990, pp. 781-784.

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Widmanstatten ferrite

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