[meteorite-list] Patterns in Meteorwrong

From: Jason Utas <meteoritekid_at_meteoritecentral.com>
Date: Mon, 5 Feb 2007 12:16:40 -0800
Message-ID: <93aaac890702051216w1aedb004h5b4d0e5531c4d81c_at_mail.gmail.com>

Hello All,
Regarding Widmanstatten patterns in meteorites and terrestrial iron...
The typical problem that most run into is with cosmically (or possibly
terrestrially) reheated/recrystallized irons that oftentimes share an
uncanny resemblance in structure to terrestrially manufactured metal.
In many cases, especially with some of the smaller NWA and Antarctican irons
(which tend to have odd physical characteristics and chemical traits), the
irons will exhibit only the faintest pattern, or sometimes simply a
fine-grained sparkly-looking etched surface.
This is macroscopically indistinguishable from the crystal patterns that
commonly form in metal that has been put through common manufacturing
practices, as it cools slowly enough to form a small crystal pattern that
makes up a remarkably similar physical appearance.
So, do terrestrial pieces of iron exhibit Widmanstatten patterns?
No, not really, but they can display something that's not too far off....
Regards,
Jason



On 2/4/07, Steve Dunklee <sdunklee72520 at yahoo.com> wrote:
>
>
>
>
>
> I have found what looks similar to widmanstatten pattern in metal parts
> especially rail car parts that have received years of pounding under the
> pressures involved with towing cars weighing around 263k lbs with a string
> of 30 or more cars I imagine there is a lot of force involved. Most of the
> ones I have observed are parallel lines radiating from the impact point. I
> will have to check back thru my junk pile to see if I can find any . I am
> sure there are probably some metalurgist around here that can direct you to
> more information on stress fractures in metal.
> Best regards
> Steve
>
>
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Received on Mon 05 Feb 2007 03:16:40 PM PST