3.1 Describe the filing process as easy or difficult when conducting a file test for hardness on the following materials:
3.1.1 Cast steel
3.1.2 Mild steel
3.1.3 High-speed steel
3.2 FIGURE 3.2 shows the annealing process during heat treatment - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2021 - Paper 1
Question 3
3.1 Describe the filing process as easy or difficult when conducting a file test for hardness on the following materials:
3.1.1 Cast steel
3.1.2 Mild steel
3.1.3 ... show full transcript
Worked Solution & Example Answer:3.1 Describe the filing process as easy or difficult when conducting a file test for hardness on the following materials:
3.1.1 Cast steel
3.1.2 Mild steel
3.1.3 High-speed steel
3.2 FIGURE 3.2 shows the annealing process during heat treatment - NSC Mechanical Technology Welding and Metalwork - Question 3 - 2021 - Paper 1
Step 1
3.1.1 Cast steel
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Answer
The filing process for cast steel is considered difficult. This is because cast steel typically has a harder surface due to its composition and crystalline structure, which makes it resistant to filing.
Step 2
3.1.2 Mild steel
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Answer
The filing process for mild steel is regarded as easy. Mild steel is soft and ductile, allowing for straightforward filing without excessive wear on the file.
Step 3
3.1.3 High-speed steel
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Answer
The filing process for high-speed steel is described as difficult. High-speed steel has a high hardness and tensile strength, making it challenging to file due to its resistance to abrasion.
Step 4
3.2 Label components A–C
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Answer
A. Grain growth.
B. Recrystallisation.
C. Recovery.
Step 5
3.3 Describe how a bending test is conducted to determine the properties in a test metal
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To conduct a bending test, the test piece should be bent through a specific angle or around a mandrel or bar, which has a defined radius, until rupture occurs. After bending the material, it should be placed in a vice to observe its ductility.
Step 6
3.4 State the purpose of case hardening on steel
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Answer
The purpose of case hardening on steel is to create a hard surface while maintaining a tough core, enhancing the steel's wear resistance and durability.
Step 7
3.5 Name THREE types of quenching media that could be used to harden steel
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