COOLING CURVE

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

4. .

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

8. Eutectic reaction

10. Peritectic reaction

12. Eutectoid reaction

14. Peritectoid reaction