Abstract
Conventional transmission electron microscopy studies of thin foil martensites in some ferrous alloys showed that morphology and substructure of this martensite are different than those of bulk martensite of the same alloys (1-4). Oshima and Wayman (1,2) examined the substructure of thin loll and bulk martensites in some Fe-b~-(Cr)-C alloys and described the substructure of thin foil martensite as more complex.In their study of thin foil martensite formation in Fe-Ni and Fe-Ni-C alloys Maki and Wayman (3,4) made a detailed comparison between thin foil and bulk martensites.These authors reported that thin foil martensites thicken gradually during cooling and contain no midrib. They also noted the more segmented appearance of (ll2) type transformation twins.
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