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Time Temperature Transformation (TTT) Diagrams

e1 temperature, coarse pearlite forms at close to A e1 temperature due to low driving force or nucleation rate. At higher under coolings or lower temperature finer pearlite forms. At the nose of TTT diagram very fine pearlite forms Close to the eutectoid temperature, the undercooling is low so that the driving force for the transformation is small.


  Temperatures, Nucleation




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