Dear Farhang,
Based on my experience in laboratory, in some cases metallographic microstructures could not show the material whether normalized or not because this type of heat treatment will not affect microstructure as much as other heat treatments e.g. annealing. However in some cases we could see normalized microstructure clearly. The big problem is we have no judgment base for differing between normalized or non-normalized microstructures for different kind of materials.
I think because of that, standards based their qualifications on impact test (we have keep in mind that normalizing will improve toughness properties, I mean the subject is toughness not the normalizing by itself). So if you test a material and qualify for impact, you can assume it as normalized material or a material treated at least equal to normalizing.
Regards
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Dear All
I need to know how can understand that ASTM A516 Gr.70 is normalized or not?
Somebody told me:
"according to clause 5.3 of ASTM A516 standard (attached), when we apply charpy impact test on a material and it pass the impact test successfully, we can say the material is surly normalized but if the material can't pass the impact test, we shall apply metallographic test to understanding if the material is normalized.
And somebody said me:
"we have just 1 way to know that is the material normalized or not. And its metallographic test."
M. Farhang
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