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For a steel containing 0 8 carbon

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For a steel containing 0.8% carbon

Answer & Solution
Correct Answer: Option B
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.
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