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PDF Continuous Cooling Transformation (CCT) Diagrams shown in the diagram. For cooling curve B, at T 1 temperature minimum t 1 timing is required to nucleate pearlite as per TTT diagram in Fig. 8. But material has spent t 1 timing at higher than T 1 temperature in case of continuous cooling and incubation period at higher temperature is much more than t 1. The nucleation condition TTT Diagram of steel in Material science - Materials Today TTT diagram of steel is called isothermal transformation diagram or time-temperature-transformation diagram. It presents a logarithmic plot between temperature and time. TTT Diagrams: Introduction and Limitations | Material ... Isothermal transformation diagram, also called as TTT diagram, measures the rate of transformation at a constant temperature i.e. it shows time relationships for the phases during isothermal transformation. Ttt diagram explanation