Abstract
Thin films of Fe-18Cr-12Ni have been examined both in the fully austenitic condition and after partial transformation in the bulk to faulted h.c.p. (ε) and to b.c.c. martensite (α′). The ε appeared to be a consequence of α′ formation rather than a necessary intermediate stage in the transformation. Fe-10Cr-15Ni and Fe-5Cr-20Ni thin films were examined in the fully martensitic condition. In these two alloys adjacent regions of α′ were delineated by subgrain boundaries and were not twin-related, though twin relationship was established for adjacent α′ crystals in Fe-18Cr-12Ni. For all alloys the α′ has a dense dislocation substructure.
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