Continuous cooling transformation

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] These diagrams are used to represent which types of phase changes will occur if a material at 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.

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