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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: anyone ever had "cryogenic" treated parts??
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Sat, 19 July 2003 07:24
 
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well, when you quench a steel to form martensite (from austenite) as is done with gear teeth, not all the austenite changes, so some is left over in a metastable state, by cooling down, you increase the driving force for change to the more stable martensite (which is itself metastable, but that's a bit diffrent  ) although the kinetics are very slow at low temps, the driving force is high but it still takes a long time (days instead of hours). this change will remain at room temp because it is more stable than it was previously (fro a free energy / thermodynamic point of view)
that cryo treatment works in this situation (for quenched and tempered parts with surface hardening) is a researched fact. what i question is the other crap like making plastics stronger, yet less brittle and more wear resistant... and especially the brake pad bit....
i think they are taking it a bit far
and 300%? it's pretty hard to make steel, especially gear steel, 300% stronger (i'm not sure it's even possible)
maybe they mean wear resistance, which might be possible depending on the failure mechanism of the surface....
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| | Subject | Poster | Date |
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anyone ever had "cryogenic" treated parts??
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oldcorollas | Thu, 17 July 2003 18:41 |
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Re: anyone ever had "cryogenic" treated parts??
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Jayem | Thu, 17 July 2003 20:06 |
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Re: anyone ever had "cryogenic" treated parts??
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manipulate | Sat, 19 July 2003 08:49 |
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Re: anyone ever had "cryogenic" treated parts??
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Jayem | Sat, 19 July 2003 14:41 |
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Re: anyone ever had "cryogenic" treated parts??
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Allan | Sun, 20 July 2003 00:48 |
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Re: anyone ever had "cryogenic" treated parts??
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twinturbo86 | Thu, 17 July 2003 22:23 |
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Re: anyone ever had "cryogenic" treated parts??
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Jayem | Fri, 18 July 2003 09:04 |
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Re: anyone ever had "cryogenic" treated parts??
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thechuckster | Sat, 19 July 2003 01:23 |
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Re: anyone ever had "cryogenic" treated parts??
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oldcorollas | Sat, 19 July 2003 07:24 |
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Re: anyone ever had "cryogenic" treated parts??
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mrshin | Sat, 19 July 2003 08:44 |
