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That looks like roughly 15% elongation. I would expect it to start necking by then, especially when starting with essentially a notched ( threaded) bar. Also , with overall elongation of 15% , most of the elongation would be in the thread roots ,having a higher stress because of the smaller diameter. Do the thread root contours look correct ?


1

I imagine you could just cut it in half and look at the boundary under a microscope or loupe. Compare against a known sample that is hot-dipped and one that was cold-dipped. I imagine it should be fairly obvious. Another idea is to get some hardness testers and test them on some known samples. If you can't find known samples (i.e. you can find bolts labelled ...


1

There are two common techniques. The first is "crystallization separation", which takes advantage of the fact that not all species of salt precipitate out of aqueous solution in the same range of concentrations and temperatures, so one can try to manipulate the temperature and concentration (through evaporation) of the aqueous solution into a ...


1

Sure, atomic-scale resolution is possible via a variety of methods. Check out atom-probe tomography (e.g. Kolli & Seidman, Microscopy & Microanalysis, 2007) or annular dark-field scanning transmission microscopy (e.g. Voyles et al., Nature, 2002).


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