Whenever a pearlitic microstructure gets maintained for an extended period of time at temperatures close to the eutectoid temperature, spheroidite is created as a microstructural component.
What does eutectoid mean?
When a solid phase has taken the place of a water form in such a eutectic phase diagram, the term "eutectoid" is employed. Otherwise, the definitions of eutectoid and eutectic are the same. For instance, in steels, a solid gamma phase goes through a eutectoid process to transform into a lamellar combination of cementite and alpha.
The eutectoid reaction equation is it?
At 727 °C, the eutectoid reaction takes place: +Fe3C. A lamellar structure made of successive layers containing ferrite (0.022wt.% C) is produced by the diffusional transition of austenite, which decomposes at slow cooling rates to yield pearlite.
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