Abstract
The investigation of Fe-30Ni alloy, in which a martensite transformation can occur during plastic deformation or quenching in liquid nitrogen, was carried out. Application of magnetic methods allowed to determine characteristic temperatures of phase transformations and martensite volume fractions. Martensite produced during thermo-mechanical treatment was subjected to reversed transformation during subsequent annealing in a temperature range A_S�A_F. Results of microstructural analysis performed by light microscopy were correlated with mechanical properties determined in tensile tests.

Key words
iron alloys, phase transformations, magnetic properties, tensile tests, light microscopy (LM)

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