Question

Between 230 and 370°C, blue brittleness is caused in mild steel because of the

a.

immobility of dislocation.

b.

strain-ageing.

c.

increase in Young's modulus.

d.

strain hardening.

Answer: (b).strain-ageing.

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Q. Between 230 and 370°C, blue brittleness is caused in mild steel because of the

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