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Home/Reference Data/Binary Phase Diagrams/Fe-C/eutectoid

Eutectoid — Fe-C

Alloy System
Fe-C
Invariant Point Or Boundary
Eutectoid
Component 1 Name
C
Composition 1 Wt Pct (wt%)
0.76
Engineering Significance
Critical for Steel Heat treatment; Steels with <0.76% C Are Hypoeutectoid (ferrite+pearlite); >0.76% Hypereutectoid (pearlite+cementite)
Phase Alpha
Ferrite
Phase Beta
Cementite
Phase Description
Austenite -> Ferrite + Cementite (Fe3C); Pearlite Microstructure
Phase Gamma
Pearlite
Reaction Type
Eutectoid
Temperature C (C)
727

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Fe-C — invariant point or boundary eutectoid · engineering significance Critical for steel heat treatment; steels with <0.76% C are hypoeutectoid… · phase description Austenite -> ferrite + cementite (Fe3C); pearlite microstructure · composition 1 wt pct 0.76 wt% · temperature C 727 C | Binary Phase Diagrams | Engineering Database