Abstract
This paper proposes an alternative to the Avrami equation capable of describing whole transformation curves with significant fitting-correlations. The model bears physically meaningful parameters which permit considering the initial transformation kinetics independently from the subsequent microstructural evolution. Data of martensite, bainite, recrystallization, and pearlite transformations validate the model. Further to the expeditious description of transformation curves, the model guides the modeling of specific mechanisms.
Highlights
The description and the interpretation of transformation data are of considerable importance in research, in product/ process development, as well as in the production of engineering materials
To describe the kinetic curve, i. e. fraction transformed against time, it is necessary to resort to phenomenological expressions
Subsequent work suggested that the equation could describe bainitic transformations[7]
Summary
The description and the interpretation of transformation data are of considerable importance in research, in product/ process development, as well as in the production of engineering materials. One often has only partial or no understanding of the underlying mechanism of the transformation. In these circumstances, to describe the kinetic curve, i. E. fraction transformed against time, it is necessary to resort to phenomenological expressions. The fitting parameters often admit interpretation in terms of the kinetic and microstructural aspects of the transformation. The proposed alternative to Avrami’s equation was introduced to describe martensitic transformations[5,6,7]. Subsequent work suggested that the equation could describe bainitic transformations[7]. The utility of such fitting depends on the conceptualization of the model constants and parameters in terms of the intrinsic aspects of the transformation and/or processes
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