In-situ high energy X-Ray diffraction (HEXRD) was used on compositionally graded steels\nto study the effect of substitutional elements on ferrite growth kinetics in Fe-C-X and Fe-C-X-Y\nsystems. Two systems were selected to illustrate the applicability of the combinatorial approach in\nstudying such transformations, Fe-C-Mn and Fe-C-Mn-Mo. Comparison between the measured\nferrite growth kinetics using HEXRD and the predicted ones using Para-Equilibrium (PE) and Local\nEquilibrium with Negligible Partitioning (LENP) models indicates that the fractions reached at\nthe stasis of transformation are lower than the predicted ones. Experiments indicated a deviation\nof measured kinetics from both PE and LENP models when increasing Mn and decreasing Mo\n(in Fe-C-Mn-Mo system). The large amount of data that can be obtained using this approach can be\nused for validating existing models describing ferrite growth kinetics.
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