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
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
Conducting a file test for hardness on cast steel is considered difficult. Cast steel tends to have a hard surface due to its carbon content, which makes it resistant to filing.
Step 2
3.1.2 Mild steel
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Answer
Mild steel is easy to file. Its lower carbon content makes it softer and more malleable, allowing the file to cut through it without much resistance.
Step 3
3.1.3 High-speed steel
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Answer
Conducting a file test for hardness on high-speed steel is also difficult. High-speed steel is designed to withstand high temperatures and maintain hardness, making it challenging to file.
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, first place the test piece through a specified angle or around a mandrel, ensuring it has a defined radius. Then exert force until a rupture occurs in the metal. Lastly, observe the ductility of the material based on how it deforms before breaking.
Step 6
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 core, enhancing the wear resistance of the material.
Step 7
Name THREE types of quenching media that could be used to harden steel.
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