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Continuous Cooling Transformation (CCT) Diagrams

Continuous Cooling Transformation (CCT) DiagramsR. MannaAssistant ProfessorCentre of Advanced StudyDepartment of Metallurgical EngineeringInstitute of Technology, Banaras Hindu UniversityVaranasi-221 005, Steel-TRAERF Faculty Fellowship Visiting ScholarDepartment of Materials Science and MetallurgyUniversity of Cambridge, Pembroke Street, Cambridge, CB2 Cooling Transformation (CCT) diagramThere are two types of CCT diagramsI) Plot of (for each type of Transformation ) Transformation start, specific fraction of Transformation and Transformation finish temperature against Transformation time on each Cooling curveII)

Therefore phase transformation start at b i.e. at temperature T S and transformation ends or finishes at c or temperature T F. The nature of transformation has to be determined by metallography. When austenite fully transforms to a single product then amount of transformation is directly proportional to the relative change in length.

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