Iron-Carbon Equilibrium Diagram (Leaving Cert Engineering): Flashcards
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What does the iron-carbon equilibrium diagram show?
What does the iron-carbon equilibrium diagram show?
Relationship between temperature & carbon content in alloys
Vertical axis of iron-carbon diagram
Vertical axis of iron-carbon diagram
Temperature (°C, 0-1000°C)
Horizontal axis of iron-carbon diagram
Horizontal axis of iron-carbon diagram
Carbon content (%, 0-1.8%)
Austenite definition
Austenite definition
Solid solution where carbon atoms are dissolved in iron structure
Austenite crystal structure
Austenite crystal structure
Face-centred cubic (FCC)
Temperature above which austenite forms
Temperature above which austenite forms
Above 910°C
Ferrite definition
Ferrite definition
Nearly pure iron with very low carbon content
Ferrite crystal structure
Ferrite crystal structure
Body-centred cubic (BCC)
Temperature below which ferrite exists
Temperature below which ferrite exists
Below 810°C
Pearlite composition
Pearlite composition
Alternating thin layers of ferrite and cementite
Cementite definition and property
Cementite definition and property
Iron carbide compound that provides hardness
Lower critical temperature value
Lower critical temperature value
723°C
Upper critical temperature value
Upper critical temperature value
910°C
Result of slow cooling 0.4% C steel from 900°C
Result of slow cooling 0.4% C steel from 900°C
Ferrite and soft pearlite (softest material)
Result of rapid cooling (quenching) from 900°C
Result of rapid cooling (quenching) from 900°C
Martensite (hard, needle-like, strong but brittle)