During Faster Cooling Austenite Transforms to?

During the ferrite transformation, carbon diffuses into austenite, which increases the hardenability of this phase. The aim of the fast cooling stage is to transform the remaining austenite into martensite.

At what temperature does the last austenite transform on cooling?

A carbon steel containing approximately 0.77% C becomes a solid solution at any temperature in the austenite temperature range, i.e., between 725 and 1370 C (1340 and 2500 F). All of the carbon is dissolved in the austenite. When this solid solution is slowly cooled, several changes occur at 725 C (1340 F).

What is the transformation product of austenite?

After crossing the A₁ line, the remaining austenite transforms to pearlite. This reaction is called the eutectoid reaction, and it is very similar with the eutectic reaction of cast irons. In eutectoid reaction, solid austenite transforms to two solid phases forming a lamellar (eutectic) structure.