Continuous cooling transformation diagram of EN S355 (ASTM A-572 Grade 50, warranted yield stress 355 MPa) for welding (fast cooling, linear scale). A continuous cooling transformation (CCT) phase diagram is often used when heat treating steel. [1]

CCT diagrams are determined by measuring some physical properties during continuous cooling. Normally these are specific volume and magnetic permeability. However, the majority of the work has been done through specific volume change by dilatometric method. This method is supplemented by metallography and hardness measurement.

Dec 15, 2018 · CCT diagrams allow predictions of hardness and microstructure in simple shapes quenched in oil, water, or other quenchants. In the last column, we discussed the construction and application of Time Temperature Transformation or Isothermal Transformation diagrams.

CCT diagrams provide information on the transformation start and finish temperatures, as well as the cooling rate required to achieve specific phases. TTT diagrams, on the other hand, focus on the time-temperature relationship for phase transformations, showing the incubation, growth, and completion stages of different microstructures.

The continuous cooling diagram (CCT diagram) gives a more accurate picture for heat treatments involving continuous cooling. The CCT diagram is a plot of temperature versus the logarithm of time for a steel alloy of definite composition.

Continuous cooling transformation (CCT) diagrams explain the effect of rate of cooling. In the figure to the left, this is illustrated with the dotted curved lines. Continuous cooling curves represent what happens in actual practise when an engineering component is cooled from the austenitic region.

Feb 8, 2023 · The CCT curve shows that the more alloys that increase hardenability, such as Cr and Mo, are included in the steel, the more the entire curve shifts to the right side, resulting in higher hardness even at slower cooling rates.

Continuous cooling transformation (CCT) diagrams are widely used when heat treating steels and represent which type of phase will occur in a material as it is cooled at different cooling rates.

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.

The CCT curves of the two experimental steels were determined using a thermal simulator, and the phase transformation laws of the two experimental steels under continuous cooling were...