Alpacca Fortyfive
Stainless
- Joined
- Nov 16, 2007
- Location
- Leinster, Ireland
A thought occoured while looking through Ben's straight edge thread - as a thought is something of a rare occurance, here goes.
Ferrite, the main phase you'd hope for in a fully annealed and stress relieved cast iron, should not remain magnetic (please correct me if I'm wrong on that).
For the straight edge to be magnetic, implies that there is some martensite in there, either that or some seriously distorted ferrite or austenite
any of those imply that the anneal or stress relief process has not been sufficeint, and also, that the casting will be harder than intended.
result; both greater instability and harder work scraping.
Ferrite, the main phase you'd hope for in a fully annealed and stress relieved cast iron, should not remain magnetic (please correct me if I'm wrong on that).
For the straight edge to be magnetic, implies that there is some martensite in there, either that or some seriously distorted ferrite or austenite
any of those imply that the anneal or stress relief process has not been sufficeint, and also, that the casting will be harder than intended.
result; both greater instability and harder work scraping.