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A continuous cooling transformation (CCT) phase diagram is often used when heat treating steel. These diagrams are used to represent which types of phase changes will occur in a material as it is cooled at different rates. These diagrams are often more useful than time-temperature-transformation diagrams because it is more convenient to cool materials at a certain rate than to cool quickly and hold at a certain temperature.
Types of Continuous Cooling Diagrams
There are two types of continuous cooling diagrams drawn for practical purposes
References
Continuous cooling transformation Wikipedia(Text) CC BY-SA