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metallurgy

I've seen X_Ray diffraction measured metals change phase over time at temperature (diffraction pattern changes with changing lattice). Phase is the lattice structure inside the grains. It can change from a Body Centered Cubic (BCC) to a Face Centered Cubic (FCC). In fact, we use it as an indicator of past thermal record stored in the metal. I don't recall the time vs. temperature of the different materals tested (not my departn=ment but have read reports & saw the microscopic photograghs of steels which show this as well). Anyhow, the point is ... this occurs far below the annealing temperature (temperature where the metal turns plyable because the residual stresses are eliminated while the metal is less stiff). So, if this drastic change happens before serious temperatures occur, this makes the sensitive cryogenic treatment reversal seem plausible in analogic fashion.

Otherwise, why would instruments need retreatment? I've heard retreated cymbals. The sound does become more crisp & sweet. Either something changed in this cryogenic treatmnent that hadn't changed in the prior identical cryogenic treatments before, or the treatment wears out. I find the latter more likely. YMMV


....just my 2¢

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