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Mechanical Engineering · Q24

Engineering Materials

Engineering and GATE · Mechanical Engineering · question 24

Q24

The lower critical temperature

A.
Decreases as the carbon content in steel increases
B.
Increases as the carbon content in steel increases
C.
Is same for all steels
Answer
D.
Depends upon the rate of heating

Answer: Option C

Solution

Answer: Option C
Solution:
The lower critical temperature is same for all steels.
Lower critical temperature for steel’s austenite-to-pearlite transformation is 1333°Fahrenheit (723°Celsius). Below this temperature, austentite doesn’t exist.
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