TTT diagram indicates when a specific transformation starts and ends and it also shows what percentage of transformation of austenite at a particular temperature is achieved.

Isothermal transformation diagrams (also known as time-temperature-transformation (TTT) diagrams) are plots of temperature versus time (usually on a logarithmic scale).

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.

TTT diagram stands for “time-temperature-transformation” diagram. It is also called isothermal transformation diagram. Definition: TTT diagrams give the kinetics of isothermal transformations. Davenport and Bain were the first to develop the TTT diagram of eutectoid steel.

TTT Diagram • Area between the two curves indicates the transformation of austenite to different types of crystal structures (Pearlite, Martensite, Bainite)

This type of diagram, which constitutes the so-called isothermal transformation diagram (I-T diagram, TTT diagram, or S-curve) of the steel, shows the time required for austenite to begin to transform, to proceed halfway, and to be completely transformed at any constant temperature in the range covered by the curves.

What is a TTT Diagram? A TTT diagram, also known as Time-Temperature-Transformation diagram, is a graph used in material science to understand the transformation behavior of a material as it undergoes cooling or heating at different temperatures and …

The time and the temperature of holding is given by the TTT curve of the steel. As the isothermal annealing is normally done to soften the steel, the temperature of isothermal holding is very close to but below A 1 (by 30- 100°C).

2024年8月15日 · To determine what will happen to an alloy as it cools under non-equilibrium conditions, metallurgists use a Time Temperature Transformation (TTT) curve. What is a TTT curve? A TTT curve plots the temperature on the y-axis and the time on the x-axis. The body of the graph consists of regions that represent different microstructures.

In a temperature-time diagram with the time expressed in a logarithmic scale, by plotting the times t i and t indicating the start and end time of austenite transformation at each temperature T2, two transformation start and end curves are obtained. The TTT …