There is a eutectoid point in the Fe-C system around 723 °C, or roughly 0.8 wt% C.
A spot on a phase diagram that shows an alloy's eutectoid composition and eutectoid temperature. Additionally, the eutectoid point identifies the spot where three solid phases coexist. This point implies a temperature of 1333 F and a carbon concentration of 0.8% in the iron-carbon phase diagram.
The phase change of one solid into two other solids is known as the eutectoid reaction. A eutectoid point exists in the Fe-C system around 723 °C, or about 0.8 wt% C. Austenite, also referred to as gamma, is the phase that exists for plain carbon steels immediately above the eutectoid temperature.
The lowest temperature at which a material can exist as a single solid solution phase is known as the eutectoid temperature.
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