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 Automotive - 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 Automotive - 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. This is due to its typically hard and brittle nature, which can cause rapid wear on the file.
Step 2
3.1.2 Mild steel
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Answer
The filing process on mild steel is considered easy. Mild steel is softer and more ductile, allowing for smoother and more efficient filing.
Step 3
3.1.3 High-speed steel
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Answer
The filing process on high-speed steel is considered difficult. High-speed steel is designed for durability and hardness, requiring tools that can withstand its tough texture.
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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Answer
To conduct a bending test, the test piece is bent through a specific angle or around a mandrel, ensuring it has a defined radius, until a rupture occurs in the metal. The material should be secured in a vice during the bending process, and observations should be made regarding the ductility of the material.
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 toughness.
Step 7
3.5 Name THREE types of quenching media that could be used to harden steel
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