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 |
ArtechnikA |
Feb 9 2004, 01:17 PM
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#2
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rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
it's pretty well thought of in the rifle barrel industry.
think about this: why would we believe the effects of heat-treating stop at room temperature just because that's a comfortable environment for humans ? the theory, as i've heard it explained, is that the heat-treat chemical process in the steel continues right down approaching absolute zero. i have seen before/after tests on gun barrel accuracy in which residual stresses produced 'stringing' (asymetrical thermal expansion causing barrel curvature and a 'string' (line) of hits) that wa eliminated following cryo treatment. i know some people who claim wonderful effects in aluminum alloy, but as that does not have the austenite/martensite bi-phase thing, i'm skeptical there. but i haven't seen any 'before and after' product tests either, so i donno. i know life extension is claimed for brake rotors, but since it seems to double life at double the cost, i'd think it beneficial mostly to endurance racers who could potentially avoid a mid-race rotor swap and gain a competitive advantage. for other parts - connecting rods ? crankshafts ? camshafts ? i s'pose it couldn't hoit, especially if there were a friction reduction. my water-VW camshafts have shown no visible lobe wear after 350,000 mi so i hope it has a more compelling reason than just wear reduction. OTOH - those cams may have had an expensive surface treatment that costs more than cryo would. i'm no metallurgist, i just know what i read ... |
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