This paper describes the formation of supersaturated ferrite in a series of Fe-Cu and Fe-Cu-Ni alloys which have been directly transformed from austenite. It is shown that supersaturated ferrite can be formed at all temperatures of transformation and that although, within certain temperature limits, the ferrite produced is similar to the ‘massive ferrite’ observed in many alloy systems during continuous cooling transformations, not all the features of this reaction product are fully consistent with a massive phase.
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