Iron-Carbon Equilibrium Diagram (Leaving Cert Engineering): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is displayed on the vertical axis of the iron-carbon equilibrium diagram?
What is displayed on the vertical axis of the iron-carbon equilibrium diagram?
Temperature in °C
What crystal structure does austenite have?
What crystal structure does austenite have?
Face-centred cubic (FCC)
At what temperature does austenite begin to form?
At what temperature does austenite begin to form?
Above 910°C
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?
Alternating 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 for steel?
What is the lower critical temperature for steel?
723°C
Above what temperature does steel become fully austenitic?
Above what temperature does steel become fully austenitic?
910°C
What structure forms when 0.4% carbon steel cools slowly from 900°C?
What structure forms when 0.4% carbon steel cools slowly from 900°C?
Ferrite and soft pearlite
What structure forms when steel is rapidly cooled (quenched) from 900°C?
What structure forms when steel is rapidly cooled (quenched) from 900°C?
Martensite
Why is martensite not shown on the equilibrium diagram?
Why is martensite not shown on the equilibrium diagram?
It represents a non-equilibrium condition
Which phases are present in Region 4 of the equilibrium diagram?
Which phases are present in Region 4 of the equilibrium diagram?
Pearlite and ferrite