Cryogenic Technical Articles |
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Cryogenic Technical Articles |
lmcchesney |
Feb 9 2004, 09:31 AM
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#1
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Member Group: Members Posts: 488 Joined: 24-November 03 From: Ocala, Fl. Member No.: 1,381 Region Association: None |
I have reviewed all the messages from the foum regarding cryogenic processing of engine parts. However, it lacks good/significant documentation regarding the different processes done.
Does anyone know the source of technical articles regarding this process. There must be some University site with this information. Yes, I have searched the MIT site without success. Anyone have the information? Thanks, L. McChesney |
airsix |
Feb 9 2004, 01:27 PM
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#2
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I have bees in my epiglotis Group: Members Posts: 2,196 Joined: 7-February 03 From: Kennewick Man (E. WA State) Member No.: 266 |
Cryo treatment is common as part of the heat-treatment of several carbon and stainless tool steels. When heat treating steel it is taken to a specific temp where it undergoes a molecular change to a state called austenite. The steel is then 'quenched' to quickly reduce it's temperature. Quenching changes the steel to a state called martensite (assuming everything went according to plan). Some steel has molecules that tend to linger and may not fully convert to martensite, but instead end up as something else like pearlite. Cryo treatment of certain steels can get some of these lingering molecules transformed to martensite. The result is more uniform grain and hardness. Cryo treatment of certain stainless tool steels can increase hardness after heat treat by one or two points on the Rockwell C scale. I don't know what legitimate benefits can be had from cryo treatement of metals that are not being subjected to a heat-treating/hardening process. When I hear about iron brake rotors and the like being cryo treated I tend to raise and eyebrow. Sounds like snakeoil (but I could be wrong).
-Ben M. |
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