Abstract
The material investigated was Fe-30Ni (wt %) alloy with various morphologies and volume fractions of martensite induced by plastic deformation or quenching in liquid nitrogen. The characteristic temperature of phase transformations, especially the start temperature of martensitic transformation M_S, was determined using magnetic measurements. It was found that M_S is affected by the grain size of the alloy. The use of thermo-mechanical treatment leading to martensitic transformation followed by annealing above the start temperature of reversed transformation resulted in refining of the alloy microstructure and improvement its strength and ductility.

Key words
iron alloys, deformation structure, reversed martensitic transformation, light

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