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[MW:32090] Impact energy Vs Structure

By Materials & Welding
Dear Friends,
Consider we have a mild-steel, cooling fast from welding temperature, we must have a fine grain structure with martensite formation.
Hypothetically, considering that we want to use this structure. I was wondering what is the relation between the impact energy and the structure? will it be decreased due to martensite formation? or increased due to fine grain? I understand that we don't use the martensite state of structures and we need to quench and tempering them.

Thanks,
Emad

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