What is the CCT diagram?
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.
How many types of CCT diagrams are there?
How many types of CCT diagram are there? Explanation: There are two types of continuous cooling transformation diagrams which can be drawn. In the two type, some factors are changed to obtain a different curve.
What does CCT diagram stand for MCQ?
Explanation: An individual equilibrium diagram like the Fe-Fe3C can be used to depict an entire alloy system of various compositions. However, a TTT or a CCT diagram can only be used for one steel of a specified composition. 3. What does CCT diagram stand for? a) Constant-critical-temperature.
How is a TTT diagram constructed?
Transformation of austenite is plotted against temperature vs time on a logarithm scale to obtain the TTT diagram. The shape of diagram looks like either S or like C. temperature due to low driving force or nucleation rate. At higher under coolings or lower temperature finer pearlite forms.
What is CCT and TTT diagram?
The primary difference between TTT diagrams and CCT diagrams is that TTT diagrams examine the progress of transformation as a function of time, at a fixed temperature. CCT diagrams examine the progress of transformation as a function of changing temperature.
What is the full form of TTT diagram?
Isothermal transformation diagrams (also known as time-temperature-transformation (TTT) diagrams) are plots of temperature versus time (usually on a logarithmic scale).
Which type of curves are used to construct TTT diagram?
Explanation: S curve, C curve isothermal diagram and Bain’s curve are all names given to time temperature transformation diagrams.
What is the difference between CCT and TTT diagram?
Why TTT diagram is called S curve?
Time-Temperature-Transformation (TTT) diagram or S-curve refers to only one steel of a particular composition at a time, which applies to all carbon steels. This diagram is also called as C-curve isothermal (decomposition of austenite) diagram and Bain’s curve. Austenite is stable above eutectoid temperature 727 °C.
