Before transforming to pearlite, this material phases through the two-phase zone (yellow) between austenite and ferrite. In cooling through this zone, ferrite is precipitated on the austenite grain ...

(a) Small austenite grain size leading to plates of ferrite growing in parallel formations. (b) Large austenite grain size with plates of ferrite nucleating intragranularly on non-metallic inclusions ...

The eutectoid phase transition in the iron carbon system takes place at 727 C. The three components in equilibrium at this temperature are Austenite, g, with the composition Fe - 0.77 wt % C, Ferrite, ...

Both types of reaction occur by nucleation and growth (Fig. 3.14a), and rely on diffusion. Pearlite nuclei occur on austenite grain boundaries, but it is clear that they can also be associated with ...

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