Engineering Materials

In a hardening process, the hypo-eutectoid steel is_____.

  • A. Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
  • B. Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
  • C. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
  • D. Heated below or closes to the lower critical temperature and then cooled slowly
Answer: Option B.
Explanation:

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