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Transformation of austenite to bainite starts from the nucleation of ______ at austenite...

Q.  
Transformation of austenite to bainite starts from the nucleation of ______ at austenite grain boundary.


Answer & Explanation

The transformation of austenite to bainite begins with the nucleation of ferrite at the grain boundaries of austenite. Bainite forms when the cooling rate is moderate, faster than pearlite but slower than martensite formation.

Thus correct option is: A.

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