At present, no physically substantiated theory describes the effect of the submicrocrystalline structure of materials on phase transformations occurring under thermal and deformation actions. This is primarily the case for martensitic transformations, which are rather sensitive to the structural characteristics of the initial phase [1, 2]. In this study, we consider the features of a martensitic transformation in Fe-Ni(29-30%)-C(0.02%) microcrystalline alloys, where the grain sizes of the initial y phase are varied by using intense plastic deformation followed by recrystallization annealing.
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