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Ni-resist 2b

Ni-resist 2b

Ni-resist 2b

(OP)
We need to shrinking cylinder liner material Ni-resist 2b and assembly in cylinder bore,but we are not sure this material can dip in liquid nitrogen for shrink it or not. please someone that know very well help us too.

RE: Ni-resist 2b

This link has a short discussion of Ni resist at cryogenic temperatures.

https://tecnosuiza.cl/archivos/documento-tecnosuiz...

This link discusses some of the effects of cryogenic treatement.
https://solarmfg.com/wp-content/uploads/2021/09/cr...

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.

RE: Ni-resist 2b

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.
https://nickelinstitute.org/media/8da6f40488b5932/...
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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