4.1 Name TWO properties of EACH of the following structures of steel:
4.1.1 Cementite
4.1.2 Pearlite
4.2 FIGURE 4.1 shows a diagram - NSC Mechanical Technology Welding and Metalwork - Question 4 - 2017 - Paper 1
Question 4
4.1 Name TWO properties of EACH of the following structures of steel:
4.1.1 Cementite
4.1.2 Pearlite
4.2 FIGURE 4.1 shows a diagram. Answer the questions that fol... show full transcript
Worked Solution & Example Answer:4.1 Name TWO properties of EACH of the following structures of steel:
4.1.1 Cementite
4.1.2 Pearlite
4.2 FIGURE 4.1 shows a diagram - NSC Mechanical Technology Welding and Metalwork - Question 4 - 2017 - Paper 1
Step 1
4.1.1 Cementite
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Answer
Cementite is a hard and brittle structure. This property makes it useful in certain applications but also limits its ductility.
Step 2
4.1.2 Pearlite
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Answer
Pearlite possesses good ductility, is very hard, and is strong and tough. These characteristics make it favorable in structural materials.
Step 3
4.2.1 What is the diagram in FIGURE 4.1 above called?
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Answer
The diagram in FIGURE 4.1 is called the Iron–carbon equilibrium diagram.
Step 4
4.2.2 Label A–E shown on the diagram.
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Answer
A = Ferrite + Pearlite
B = Austenite + Ferrite
C = Austenite
D = Austenite + Cementite
E = Ferrite + Cementite
Step 5
4.2.3 State TWO properties of C on the diagram.
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Answer
The properties of C (Austenite) are:
It has a soft grain structure.
It exhibits good ductility.
Step 6
4.3 What is the lower critical temperature for carbon steel with a carbon content of 0,87%?
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Answer
The lower critical temperature for carbon steel with a carbon content of 0,87% is 720°C.
