Does impact toughness depend on diameter?

[MrMetals]

If there were multiple diameters of bar made from the same heat at a mill, would the mill perform a Charpy test on each individual diameter bar or would they just test one representative sample from the entire heat/lot? Meaning would they machine the same size charpy sample from two different diameter bars from the same heat.

 

[metengr]

The mill would not perform CVN impact testing for each diameter of the same heat or any testing unless required by material specification or client requirements.

 

[MrMetals]

thanks, this is what I thought beforehand and was confirmed by the mill. They missed a charpy requirement and now we need to retest various heats. Thanks for the response.

 

[EdStainless]

It depends on materials as to the effect of diameter on toughness.
In most alloys that I work with if they tested transverse toughness on the largest diameter at midradius then I would believe it.
If this product has been cold worked or heat treated then I would require testing of every size. They were made differently and they will have different properties.

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P.E. Metallurgy, Plymouth Tube