Mechanical Engineering - Engineering Materials - Discussion

3. 

The temperature point at which the change starts on heating the steel is called

[A]. lower critical point
[B]. upper critical point
[C]. point of recalescence
[D]. point of decalescence

Answer: Option A

Explanation:

No answer description available for this question.

Sandy said: (Aug 13, 2018)  
Please explain the answer.

Pathan said: (Nov 4, 2019)  
According to the iron carbon diagram changes in phase starting from the lower critical point.

For Better understanding refer FE-C diagram.

Gaurav said: (Feb 12, 2020)  
They are asking about temperature points.

We know that up to the upper critical structure, not changes. As we heat above the upper critical then structure changes start.

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