Structure-phase state and characteristics of martensitic transformations in Fe-Ni alloy (Fe - 31 wt.% Ni) ribbon quenched from melt were investigated by x-ray, optical microscopy and magnetomethric methods. X-ray investigated shown the significant texture of austenite. The peculiarities of characteristics of the direct g-a- and reverse a-g-martensite transformations connected with existence of microcrystalline and nanocrystalline component of initial austenite were founded.

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