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Growth of Ni-Resist Iron

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MOB1

MOB1

Materials
Joined
Feb 11, 2003
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69
Location
AU
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?
 
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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.

 
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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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