ISOTHERMAL AND ATHERMAL PHASE-TRANSFORMATION OF FENIMO ALLOYS

Kinetic dependence of martensitic transformation and properties change s in Fe-24%Ni-5%Mo alloys with different carbon content have been obta ined. Internal friction method was used for the precise investigation of structural changes after austenization, during martensitic transfor mation at sub zero temperature and during the postheat. The influence: (i) of frequency of oscillations, (ii) rate of cooling and (iii) ampl itude of deformation on the time-temperature dependent internal fricti on during martensitic transformation have been shown. The curves of is othermal decay of austenite have been presented and we have discussed the type and kinetics of martensite transformation, and also the pecul iarities of structural formation of martensite. The influence of the c omposition on the character of phase transformation is connected with the redistribution of interstitials between the dislocations and auste nite solid solution before the martensitic transformation at lower tem peratures.