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Ni-resist 2b
- Thread starter Kns_NaB.
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This link has a short discussion of Ni resist at cryogenic temperatures.
This link discusses some of the effects of cryogenic treatement.
If ball or roller bearings are subjected to cryogenic temperatures to ease installation even briefly retained austenite is transformed to martensite and dimensions change to a catastrophic degree.
Dry ice in alcohol is warmer and thus sometimes safer than a liquid nitrogen bath.
Using liquid nitrogen we suspend bearings in the fog cloud above the liquid nitirgen and monitor the beairng temperture so as to not go Too low/cold.
This link discusses some of the effects of cryogenic treatement.
If ball or roller bearings are subjected to cryogenic temperatures to ease installation even briefly retained austenite is transformed to martensite and dimensions change to a catastrophic degree.
Dry ice in alcohol is warmer and thus sometimes safer than a liquid nitrogen bath.
Using liquid nitrogen we suspend bearings in the fog cloud above the liquid nitirgen and monitor the beairng temperture so as to not go Too low/cold.
EdStainless
Materials
Give that this is a cast iron do not submerge in LN.
Hang it in the very cold gas above the liquid.
Being a gray (flake) cast iron these will have no impact toughness or ductility while cold.
Handle very carefully and don't shock them, either mechanical or thermal.
NiDI has the old (but very thorough) Ni-Resist handbook online.
Ni-Resist will have a fairly large TempCo so you will get quite a bit of size change.
You may not need/want to go that cold. CO2 and alcohol may be a good option.
Have the parts been stress relieved (1200F)? We actually used to give them a stabilization HT (1500F).
They will keep shape better if they have been HT.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
Hang it in the very cold gas above the liquid.
Being a gray (flake) cast iron these will have no impact toughness or ductility while cold.
Handle very carefully and don't shock them, either mechanical or thermal.
NiDI has the old (but very thorough) Ni-Resist handbook online.
Ni-Resist will have a fairly large TempCo so you will get quite a bit of size change.
You may not need/want to go that cold. CO2 and alcohol may be a good option.
Have the parts been stress relieved (1200F)? We actually used to give them a stabilization HT (1500F).
They will keep shape better if they have been HT.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed
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