# TTT Diagrams

If you are not familiar with TTT diagrams, check out the following diagrams, available with a brief explanation about the isothermal diagrams. Isothermal transformation diagrams (TTT) diagrams) are plots of temperature versus time. They are generated from percentage transformation VS time measurements. Let’s see the first example of the diagram that we provided below.

TTT diagrams are useful for understanding the transformations of an alloy steel at elevated temperatures. This diagram is only valid for one specific composition of material, and only if the temperature is held constant during the transformation, and strictly with rapid cooling to that temperature. Though usually used to represent transformation kinetics for steels, they also can be used to describe the kinetics of crystallization in ceramic or other materials. Take a look at the diagrams below.

There are two main types of transformation diagram that are helpful in selecting the optimum steel and processing route to achieve a given set of properties. These are time-temperature transformation (TTT) and continuous cooling transformation (CCT) diagrams. Time-temperature transformation (TTT) diagrams measure the rate of transformation at a constant temperature.

On the other hand, continuous cooling transformation (CCT) diagrams measure the extent of transformation as a function of time for a continuously decreasing temperature. The diagrams that we provided above are the TTT diagrams. All of the diagrams above are free and printable. Find more interesting and educative diagrams in our site by browsing up our category!