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The effect of the thermal path to reach isothermal temperature on transformation kinetics

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Abstract

Experimentally determined isothermal transformation (IT) diagrams are valid only for a precisely described experimental condition; they are dependent on these conditions(e.g., the thermal path) and do not simply characterize the transformation. The concept of the true IT diagram, which depends only on the material considered and which characterizes the transformation independently of the experiment’s condition, is presented. On the basis of the true IT diagram, it is possible to predict and derive (1) the influence of the thermal path to reach isothermal temperature on transformation kinetics, (2) the kinetics of the transformation during continuous change of temperature, and (3) the influence of the temperature at which heat treatment starts on the experimental transformation diagram. Factors that influence a shape of experimental diagrams are discussed. It has been found that the most important ones are the shape of the true transformation diagram and the sign of temperature change (plus for heating, minus for cooling). Experimental transformation kinetics depend on overall activation energy, rate constant, and the time exponent derived for true transformation kinetics.

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Authors and Affiliations

  1. Institute of Metallurgy, Poznan Technical University, 60-965, Poznan, Poland

    I. A. Wierszyłłowski

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  1. I. A. Wierszyłłowski
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Formerly with the Laboratory of Metallurgy, Delft University of Technology, 2628 AL Delft, The Netherlands

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Wierszyłłowski, I.A. The effect of the thermal path to reach isothermal temperature on transformation kinetics. Metall Trans A 22, 993–999 (1991). https://doi.org/10.1007/BF02661092

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