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I read about it last year
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Posted by dave n (more from dave n) on Sat, 23 Feb 2002 08:54:00 Share Post by Email
In Reply to: cryo treating gears, GM, Wed, 20 Feb 2002 10:02:07
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I recall reading about it in a mechanical engineering trade magazine. The article said race teams have doubled or tripled the miles they get out of a tranny before rebuilds. Another thing I remember is them saying each cryo company keeps the times and temperatures secret. They keep parts at a given temp for period of time, etc. If the process works for the gears, what about cryo treating the bearings too?
Here's a good description:
"Cv1 is correct that some stress is relieved by the austenite to martensite transmformation. However, there are other mechanisms going on here above and beyond this transformation. Cryogenic processing will induce fatigue resistance to metals without austenite or martensite, for instance titanium and copper. For instance, I have seen a sevenfold increase in the life of automotive valve springs. The odd part about it was the springs were treated after the shot peening. Since cryogenic processing is known to relieve residual stresses other than the stresses relieved by the austenite to martensite transformation, it can be presumed that we relieved the compressive residual stresses induced on the valve springs by the shot peening, yet still had a very large increase in fatigue life."
Dave N

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