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For a steel containing 0.8% carbon

A. There is no critical point

B. There is only one critical point

C. There are two critical points

D. There can be any number of critical points

Answer: Option B

Solution(By Examveda Team)

When steels with exactly 0.8% carbon (known as a eutectoid steel), are cooled, the austenitic phase (FCC) of the mixture attempts to revert to the ferrite phase (BCC).
There is only one critical point in eutectoid steel which contains 0.8% carbon.

This Question Belongs to Mechanical Engineering >> Engineering Materials

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