Iron-Carbon Equilibrium Diagram (Leaving Cert Engineering): Flashcards
📚Flashcards
Practise the cards
14 cards from this deck
ShowHide
Practise the cards
14 cards from this deck
What does the iron-carbon equilibrium diagram show?
What does the iron-carbon equilibrium diagram show?
Relationship between temperature and carbon content in Fe-C alloys
Austenite crystal structure
Austenite crystal structure
Face-centred cubic (FCC)
Temperature austenite forms above
Temperature austenite forms above
910°C
Ferrite crystal structure
Ferrite crystal structure
Body-centred cubic (BCC)
Temperature ferrite exists below
Temperature ferrite exists below
810°C
Pearlite composition
Pearlite composition
Alternating layers of ferrite and cementite
Main property cementite provides
Main property cementite provides
Hardness
Lower critical temperature value
Lower critical temperature value
723°C
Upper critical temperature value
Upper critical temperature value
910°C
Slow cooling from 900°C produces
Slow cooling from 900°C produces
Ferrite and soft pearlite
Rapid cooling (quenching) from 900°C produces
Rapid cooling (quenching) from 900°C produces
Martensite
Martensite structure characteristics
Martensite structure characteristics
Hard, needle-like, brittle
Phases present in Region 4
Phases present in Region 4
Pearlite and ferrite
Crystal structure change on cooling steel
Crystal structure change on cooling steel
FCC (austenite) to BCC (ferrite)