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Mechanical Engineering · Q7

Engineering Materials

Engineering and GATE · Mechanical Engineering · question 7

Q7

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
Answer
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

Solution

Answer: Option B
Solution:
In a hardening process, the hypo-eutectoid steel is Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
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