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Re: (meteorobs) Meteorites and Terminal velocity
Dave>> Your point about recrystalization from reheating has merit but I
believe that to form smaller crystals the iron meteorite would have to
completely melt (2795 o F or 1535 o C ) then all of the meteorite would
have the same very small crystals that make up the fusion crust.<<
I can think of at least one instance where melting doesn't have to occur to
have crystal structure changes in heated iron. The process of making cold
chisels. It's been a long time since I've made one, but do recall that you
heat up the shaped piece of iron to a red hot temperature and then dip it
into cold water. This process results with a changed crystal structure and
very hard metal. No melting was involved.
GeoZay
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