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Strain Ageing and Yield Point Phenomenon in Mild Steel

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1. Which of the following element causes strain aging in steels other than carbon?

a: Molybdenum Explanation

Explanation

b: Nitrogen Explanation

Explanation

c: Chromium Explanation

Explanation

d: Copper Explanation

Explanation

2. Strain aging involves:

a: Nitrides Explanation

Explanation

b: Substitutional atoms Explanation

Explanation

c: Interstitial atoms Explanation

Explanation

d: Carbides Explanation

Explanation

3. Lüder bands can be seen in:

a: Creep Explanation

Explanation

b: Strain aging Explanation

Explanation

c: Strain hardening Explanation

Explanation

d: Age hardening Explanation

Explanation

4. Which is/are true for strain aging?

a: Interstitial elements pin dislocations resulting in an increased yield stress Explanation

Explanation

b: Yield point phenomenon improves the ductility and decreases the strength Explanation

Explanation

c: Unloading the sample after completion of yield point phenomenon and reloading it after heating will not show strain aging Explanation

Explanation

d: Strain aging process involves precipitation of nitrides Explanation

Explanation

5. Upper yield point is not related to

a: The point where elastic extension is terminated Explanation

Explanation

b: The point where yielding starts Explanation

Explanation

c: The point of initiation of Lüders bands Explanation

Explanation

d: The stress related to growth of Lüder bands Explanation

Explanation

6. In stress-strain plot of mild steel (showing yield point phenomenon), homogeneous deformation is related to:

a: Deformation after necking Explanation

Explanation

b: Lower yield point Explanation

Explanation

c: Elastic deformation Explanation

Explanation

d: Growth of Lüder bands Explanation

Explanation

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