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continuous cooling transformation
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
* Type 1: This is the plot of transformation start, a specific transformation fraction and transformation finish temperature for all products against transformation time on each cooling curve.
* Type 2: This is the plot of transformation start, a specific transformation fraction and transformation finish temperature for all products against cooling rate or bar diameter of the specimen for each type of cooling medium.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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