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
The filing process on cast steel is considered difficult. Cast steel has a coarse microstructure that can result in quick wear and tear of the file during hardness testing.
Step 2
3.1.2 Mild steel
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Answer
Filing mild steel is generally easy due to its softer properties, allowing for a smoother filing experience and less wear on the file.
Step 3
3.1.3 High-speed steel
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Answer
For high-speed steel, the filing process is difficult because this material is specifically designed to resist wear and retains hardness even at elevated temperatures, making it challenging to 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
A bending test is conducted by placing a test piece in a vice and bending it through a specific angle or around a mandrel until it ruptures. This process allows observation of the material's 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 on steel while maintaining a tough inner core, ensuring durability and resistance to wear.
Step 7
3.5 Name THREE types of quenching media
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