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 Automotive - 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 foll... 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 Automotive - Question 4 - 2017 - Paper 1
Step 1
4.1.1 Cementite
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Answer
Hardness: Cementite is known for its significant hardness, making it an effective material in applications requiring wear resistance.
Brittleness: While hard, cementite is also quite brittle, which can affect its performance under stress.
Step 2
4.1.2 Pearlite
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Answer
Ductility: Pearlite exhibits good ductility, allowing it to deform under tensile stress without fracturing.
Strength and Toughness: It offers a combination of strength and toughness, making it suitable for various structural applications.
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 above 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 = Austensite + Ferrite
C = Austensite
D = Austensite + Cementite
E = Ferrite + Cementite
Step 5
4.2.3 State TWO properties of Carbon on the diagram.
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Answer
Softness: The carbon content typically indicates a softer structure, making it easier to work with.
Grain structure: Carbon steel demonstrates a specific grain structure that influences its mechanical properties, impacting strength and 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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The lower critical temperature for carbon steel with a carbon content of 0.87% is 720 °C.
