D

Fig. B-12. Time, Temperature, Transformation Diagram for Plain Carbon Steel

Fig. B-12. Time, Temperature, Transformation Diagram for Plain Carbon Steel

Four important reactions that can occur during processing are shown in Fig. B.13, along with representative phase diagrams. The four reactions are called eutectic, peritectic, eutectoid, and peritectoid.

• Eutectic: In a eutectic reaction, a liquid freezes to form two solid solutions:

Liquid ^ Solid a + Solid j8

• Peritectic: In a peritectic reaction, a solid solution and a liquid react to form a solid solution of a different composition during freezing:

Solid a + Liquid ^ Solid j8

Solidus

Solidus

Solidus

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