Question
Download Solution PDFAt what carbon content and temperature does the eutectoid reaction occur in the iron-carbon equilibrium diagram, transforming austenite into pearlite?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Three important transformations of the ironcarbon equilibrium diagram
Eutectoid Reaction
- At temperature 723° C and carbon composition 0.8%
- Austenite (γ ) (S) ⇄ Ferrite (αiron) (S) + Carbide (Fe3C) (S)
- One solid converted into two solids.
Eutectic reaction
- At temperature 1130° C and carbon composition 4.3%.
- Liquid Iron (L) ⇄ Austenite (S) + Cementite (S)
- One liquid converts into two solids.
Peritectic reaction
- At temperature 1498°C and carbon composition 0.09%
- δ –iron (S) + Liquid iron (L) ⇄ Austenite (S)
- One liquid and one solid converts into another solid.
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