ok as i spend time beating hot metal i think. and i hit a question not to long back. if i get a hold of some scrap that busted from fatigue, what does it take to undo that fatigue? heating and beating. just heating? what temps? does it need to get welding temps? can it only be done by resmelting?
on a related note can you assume the fatigue is throughout the piece or might it be localized at the point of failure?
Fatigue failures are usually localized, it depends an a lot of variables. A fatigue failure is an intergranular failure. Shear failures can look like fatigue on the surface, so can tensile failures if there's not a lot of obvious elongation. When in doubt, get out the saw and cut some off; in a round bar I'd say two to three diameters worth. Pounding at welding heat should reconsolidate the crystals.
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