Starting from Entin-Zener relationship (variation of pearlitic lamellas thickness in steel, depending on temperature) applied to the hypothesis of virtual pearlitic and bainitic prelamelles, or real austenitic in the incubation period, considering a continuous diffusion mechanism of the transformation, an exponential relationship is theoretically deducted for cementitic and pearlitic lamellas thickness. The validity of Entin-Zener relationship for sub-sub-subunits of bainitic lamellas fragmentation is also demonstrated.
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