Between 230 and 370°C, blue brittleness is caused in mild steel because of the_________________?
Correct answer: B. Strain-ageing
- A. Immobility of dislocation
- B. Strain-ageing
- C. Increase in Young's modulus
- D. Strain hardening
Explanation
Blue brittleness in mild steel occurs in the intermediate-temperature range because of strain ageing, in which carbon and nitrogen atoms interact with dislocations and restrict their movement. This reduces ductility and increases brittleness.
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