Question:
The correct statement for a cold-worked material is
The correct statement for a cold-worked material is
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Cold working increases dislocation density, stabilizing hardness response.
Updated On: Jun 29, 2026
- Both Meyer and Brinell hardness increase with load
- Meyer hardness is constant and independent of load
- Brinell hardness remains constant with load
- Meyer hardness decreases with increasing load
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The Correct Option is B
Solution and Explanation
Concept:
Cold working introduces plastic deformation into a material, increasing dislocation density and hence hardness.
Hardness testing methods behave differently depending on load sensitivity.
Step 1: Understand Meyer hardness.
Meyer hardness is defined as: \[ H_M = \frac{P}{A} \] where $A$ is actual projected area of indentation. For cold-worked materials:
• work hardening is already present
• indentation behavior stabilizes Thus Meyer hardness becomes nearly constant.
Step 2: Brinell hardness behavior.
Brinell hardness is load dependent due to:
• indentation size effect
• strain hardening during indentation
Step 3: Evaluate options.
Only Meyer hardness shows minimal load dependence in cold-worked state. Final Answer: \[ \boxed{\text{Meyer hardness is constant and independent of load}} \]
Step 1: Understand Meyer hardness.
Meyer hardness is defined as: \[ H_M = \frac{P}{A} \] where $A$ is actual projected area of indentation. For cold-worked materials:
• work hardening is already present
• indentation behavior stabilizes Thus Meyer hardness becomes nearly constant.
Step 2: Brinell hardness behavior.
Brinell hardness is load dependent due to:
• indentation size effect
• strain hardening during indentation
Step 3: Evaluate options.
Only Meyer hardness shows minimal load dependence in cold-worked state. Final Answer: \[ \boxed{\text{Meyer hardness is constant and independent of load}} \]
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