It looks like different cryo treaters may do or understand their processes
differently. From what I understand, cryo does NOT treat only the surface
of the metal -- it strengthens the bonds in the entire piece -- whereas
other treatments only affect the surface. Cryo treatment transforms the
austenite in steel (softer & bigger) into martensite (smaller & harder) and
creates more smaller carbide particles throughout the steel. You are
actually changing the microstructure of the material. It also
stress-relieves most ferrous and non-ferrous materials.
Here is an informative article about the process:
http://www.engineeringtalk.com/news/cge/cge100.html
And here is a neat Web site with before and after microphotographs:
http://www.cryogenicsinternational.com/
I hope this helps!
Susan :)
Original Message:
-----------------
From: John W john@race-dogs.com
Date: Thu, 13 Oct 2005 14:50:03 -0700
To: fot@autox.team.net
Subject: Re: Nitriding and Crankshaft Durability
Cryo treating doesn't harden the metal like Nitriding does - It does change
the metal, how you'll have to ask Chuck Gee here on the board. I use Cryo
treatment on all my brake parts including the pads. The Company Chuck works
for BodyCote does this and does all my cranks exclusively as well as many
aftermarket manufactures of cranks and such. The items all need to be
machined first and only polishing after since the heat treatment is only a
few thousands thick, as well as compensating for the metal swelling, if you
grind a crank after you would take away the treatment.
John W.
Spitfire #892 DP
240z CP3
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