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Growth of Ni-Resist Iron

Growth of Ni-Resist Iron

Growth of Ni-Resist Iron

(OP)
A recent example of growth of Ni-Resist type SG iron was experienced. The material was used as a bush and was frozen in liquid nitrogen for installation purposes.  Is this just a martensite transformation issue?  Any information?

RE: Growth of Ni-Resist Iron

Hi,
are you sure? Ni-resist is described as an austenitic cast iron. Do you find a significant hardness increase?
In any case untempered martensite might be dangerous.

http://www.welding-advisers.com/

RE: Growth of Ni-Resist Iron

(OP)
I have now carried out a micro structural examination and proved that martensite transforamation is the culprit.
I have recommended freezing and tempering prior to final machining.

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