Different Phases in Fe-Fe3C Phase Diagram

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Added on 2023-06-12

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This article discusses the different phases in Fe-Fe3C phase diagram including Ferrite, Cementite, Austenite, and Pearlite. It explains their properties, crystal structures, and solubility of carbon. The article also covers the concept of peak broadening and the difference between quenching and annealing procedures. Additionally, it provides an explanation of the heat treatment process for annealing, normalizing, tempering, and quenching. Finally, the article explains the concept of age hardening and the Avrami equation.

Different Phases in Fe-Fe3C Phase Diagram

Added on 2023-06-12

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Solution
a)

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b)
Ferrite:
Solid solution of carbon in BCC iron from room temperature to 910 deg.C
 Max solubility of C is .. 0.022% at temp. of 727 deg.c
 Also called as Alpha Ferrite.
 Softest phase in Fe-Fe3C phase diagram.. less strength and High ductility
Cementite:
 Intermetallic compound of Carbon combined with Iron..Fe3C
 Max solubility of Carbon is of 6.67%.
 Orthorhombic crystal structure

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 Hardest and most brittle phase among all Fe-Fe3C phases.
Austenite:
 Solid solution of Carbon in FCC iron..Also called as Gamma Iron.
 Exists from 910–1395 deg.C
 Max solubility of Carbon .. 2.11% at 1147 deg.C
 Toughest phase among all... Strength along with optimum Ductility
Pearlite:
 Mixture of Ferrite and Cementite (alternately arranged as like pearls)
 we can find 100% pearlite at 727 deg.C.
 Soft Phase than Austenite but posses better strength than Ferrite.

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