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Questions and Answers
What type of materials can be tested using the Vickers hardness test?
What type of materials can be tested using the Vickers hardness test?
- Brittle materials like glass and ceramics
- Soft materials like rubber and plastic
- Very hard materials like mild steel and case hardened steel (correct)
- Moderately hard materials like brass, copper, and aluminum
What happens when moderately hard materials like brass, copper, and aluminum are tested using the Vickers hardness test?
What happens when moderately hard materials like brass, copper, and aluminum are tested using the Vickers hardness test?
- The material becomes softer
- The indentor makes a deep impression (correct)
- The material becomes harder
- The indentor makes a very shallow impression
What is the formula for Vickers hardness number (VHN)?
What is the formula for Vickers hardness number (VHN)?
- $VHN = \frac{Load}{Sloping or pyramidal area of the indentation}$ (correct)
- $VHN = Load \div Sloping area$
- $VHN = Load \times Sloping area$
- $VHN = 2 \times Load \times Sloping area$
How are the diagonals of the impression measured in the Vickers hardness test?
How are the diagonals of the impression measured in the Vickers hardness test?
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Why is the Vickers hardness test suitable for testing polished and hardened material surfaces?
Why is the Vickers hardness test suitable for testing polished and hardened material surfaces?
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