Iron-Carbon Equilibrium Diagram (Leaving Cert Engineering): Quizzes
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12 questions from this quiz
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Practise the questions
12 questions from this quiz
What relationship does the iron-carbon equilibrium diagram show?
What relationship does the iron-carbon equilibrium diagram show?
Temperature & carbon content
At what temperature does austenite form?
At what temperature does austenite form?
Above 910°C
What crystal structure does austenite have?
What crystal structure does austenite have?
Face-centred cubic (FCC)
What crystal structure does ferrite have?
What crystal structure does ferrite have?
Body-centred cubic (BCC)
What is pearlite composed of?
What is pearlite composed of?
Layers of ferrite & cementite
What property does cementite provide to steel?
What property does cementite provide to steel?
Hardness
What is the lower critical temperature?
What is the lower critical temperature?
723°C
What happens above the upper critical temperature of 910°C?
What happens above the upper critical temperature of 910°C?
Steel becomes fully austenitic
What forms when 0.4% carbon steel cools slowly from 900°C?
What forms when 0.4% carbon steel cools slowly from 900°C?
Ferrite & soft pearlite
What forms when steel is rapidly quenched from 900°C?
What forms when steel is rapidly quenched from 900°C?
Martensite
Which phases appear in Region 4 of the diagram?
Which phases appear in Region 4 of the diagram?
Pearlite & ferrite
Why is martensite not shown on the equilibrium diagram?
Why is martensite not shown on the equilibrium diagram?
Non-equilibrium condition