Here are three examples of recalescence. At white hot temperature https://youtu.be/5hDGYjfNGCA
Red hot temperature https://youtu.be/33neAGXxZ94 A cooler example requiring a special thermal imaging camera https://youtu.be/whHOK9pOTFg If nuclei could somehow couple to the lattice, a nuclear recalescence could last a very long time. Harry On Sat., Jul. 13, 2019, 9:44 a.m. JonesBeene, <jone...@pacbell.net> wrote: > *From: *bobcook39...@hotmail.com > > > > - In the 1960’s there was reported to be a rapid heating of large > steel block Sandia was trying to magnetize. The block turned white hot in > an instant, but did not melt. The research went dark. I can not find a > reference to that work to this day…It may have been a resonant coupling of > magnetic spin energy with the lattice. (Also it may have been rapid > reaction of hydrogen in the lattice with iron.) Either way there should be > a report. > > > > This sounds like a form of “recalescence” which is a type of strongly > energetic phase-change. A lack of a report could be simply to avoid > liability should there have been an injury. That was typical even at the > big labs fifty years ago. > > > > Significant heat transfer can occur inadvertently during the > heating/cooling cycle of iron (iron in particular and other metals as > well). Many horrible accidents in steel mills have been attributed to this > type of phase change since it is not fully understood. > > > > The dynamics of recalescence result in a surprisingly robust and sudden > temperature surge during cooling - and even a “remelt” without additional > heat - which is the extreme case since the molten steel can explode. It > has been called a type of “cyrstalization heat” which can be tied to > graphite content, but the thermodynamics of it are not completely > understood. > > > > I doubt if there a conspiracy of silence at Sandia at least not in regard > to this effect, although apparently it depends on the exact amount of > carbon and the type of carbon in the iron which is seldom known with enough > precision to avoid it. For instance, it could be possible for 2.1% > graphitic iron to strongly reheat but 2.2% to behave normally. > > >
