cooling curve

Engineering Metallurgy PPT

1. COOLING CURVE Unit -1

2. Cooling curve The solidification of molten metal is plotted as a graph is called cooling curve. X – axis – Time Y – axis -Temperature

3. Types of cooling curve Cooling curve for Pure metal or compound (liquid , solid) Cooling curve of a binary solution (liquid, solid ,liquid + solid) Cooling curve of a binary Eutectic system (liquid, solid ,liquid + solid)

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5. 1.Cooling curve for Pure metal or compound PQ -- Molten Metal Looses Its Temp Q – Starting Point For Crystal Structure QR –Latent heat is liberated Temp remains constant RS – Solid metal formation

6. CONSTRUCTION OF PHASE DIAGEAMS

7. TYPES OF EQUILIBRIUM PHASE DIAGRAM Phase diagrams for complete solid solubility ( Phase diagrams for binary isomorphous alloy systems) Phase diagrams for partial solid solubility ( Phase diagrams for binary eutectic alloy systems)

8. PHASE REACTIONS Eutectic reaction Peritectic reaction Eutectoid reaction Peritectoid reaction

9. Eutectic reaction

10. Peritectic reaction

11. Eutectoid reaction

12. Peritectoid reaction