Teach Yourself Phase Diagrams

The Iron-Carbon Phase Diagram

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• Introduction
• 1. The eutectoid reaction
• 2. Eutectoid microstructure
• 3. The hypo-eutectoid microstructure

The eutectoid reaction

Definition: A eutectoid reaction is a three-phase reaction by which, on cooling, a solid transforms into two other solid phases at the same time. If the bottom of a single-phase solid field closes (and provided the adjacent two-phase fields are solid also), it does so with a eutectoid point.

 

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