Abstract
A new equation is derived for the transformation curve of lath martensite based on the influence of transformation strain on the development of the microstructure, the view that martensite nucleation occurs within the volume of interaction of a defect, the extension of Cahn’s expression for the thickening of random planes, and consideration of martensite autocatalysis. The validation of the model was accomplished with data from plain carbon steels and from a high-strength, low-alloy steel. The results reiterate that in addition to thermodynamics the crystallographic/microstructural aspects of the martensite transformation are crux to modeling the transformation curve.
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