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 Hi... 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
Describe the filing process as easy or difficult when conducting a file test for hardness on the following materials:
3.1.1 Cast steel
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Answer
The filing process for cast steel is considered difficult due to its hard and brittle nature, which makes it challenging to file.
Step 2
Describe the filing process as easy or difficult when conducting a file test for hardness on the following materials:
3.1.2 Mild steel
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Answer
The filing process for mild steel is easy, as it is softer and more ductile, allowing for effective filing without much resistance.
Step 3
Describe the filing process as easy or difficult when conducting a file test for hardness on the following materials:
3.1.3 High-speed steel
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Answer
The filing process for high-speed steel is difficult due to its high hardness and wear resistance, requiring specialized tools for effective filing.
Step 4
Label components A–C.
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Answer
A – Grain growth.
B – Recrystallisation.
C – Recovery.
Step 5
Describe how a bending test is conducted to determine the properties in a test metal.
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Answer
To conduct a bending test, the test piece is bent around a specific angle or mandrel, ensuring it has a defined radius. This process continues until a rupture occurs in the metal. The material is secured in a vice during the bending, after which its ductility is observed by examining any deformation.
Step 6
State the purpose of case hardening on steel.
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Answer
The purpose of case hardening is to create a hard surface on steel while maintaining a tough core, enhancing wear resistance without compromising toughness.
Step 7
Name THREE types of quenching media that could be used to harden steel.
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