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 below shows the annealing process during heat treatment - NSC Mechanical Technology Fitting and Machining - 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 below shows the annealing process during heat treatment - NSC Mechanical Technology Fitting and Machining - Question 3 - 2021 - Paper 1
Step 1
3.1.1 Cast steel
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Answer
Conducting a file test on cast steel is considered difficult due to its harder microstructure and brittleness, which may lead to wear on the file.
Step 2
3.1.2 Mild steel
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Answer
The file test on mild steel is deemed easy because mild steel is softer, allowing for effective filing without excessive wear of the file.
Step 3
3.1.3 High-speed steel
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Answer
Conducting a file test on high-speed steel is seen as difficult. This is because high-speed steel has a very high hardness level, making it resistant to the file.
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
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Answer
To conduct a bending test, first position the test piece around a mandrel or bar at a defined angle. Apply a bending force until a rupture occurs in the material. Then, place the material in a vice and bend it, observing any changes to assess the ductility.
Step 6
3.4 State the purpose of case hardening of steel
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Answer
The purpose of case hardening is to create a hard surface with a tough core, enhancing wear resistance while maintaining ductility.
Step 7
3.5 Name THREE types of quenching media
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