Does impact toughness depend on diameter?

Question

Does impact toughness depend on diameter?

MrMetals (Materials)

(OP)

2 Oct 15 20:38

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 (Materials) · Answer 1 · 2015-10-03 12:44:22

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 (Materials) · Answer 2 · 2015-10-05 16:00:34

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 (Materials) · Answer 3 · 2015-10-08 22:40:51

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

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Does impact toughness depend on diameter?