Continuous-Cooling Transformation Diagram
The other more useful form of a time– temperature transformation diagram is the continuous-cooling transformation (CT) diagram.
This differs from the IT diagram in that it is constructed by cooling small specimens at various cooling rates and measuring the temperatures at which transformations start and finish
using a device called a dilatometer (a machine that measures dilation). Each phase transformation undergoes a distinct volume change (positive on cooling and negative on heating)that can be measured by a sensitive length-measuring device in the dilatometer. A CT diagram has similar features to the IT diagram shown in Fig. 7 but is produced by continuous cooling rather than isothermal conditions. A continuous-cooling diagram is applicable for most industrial processes and should be used in lieu of an IT diagram. A CT diagram can also be constructed by quenching one end of a Jominy bar described below.
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Mechanical Engineers’
Handbook: Materials and Mechanical Design,
Volume 1, Third Edition.
Edited by Myer Kutz
Mechanical Engineers’
Handbook: Materials and Mechanical Design,
Volume 1, Third Edition.
Edited by Myer Kutz
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