The influence of chemical composition and thermal treatments on the temperature-dependent internal friction of Fe—Ni alloys in the range of the phase transformation

Isothermal and Athermal Transformation of FeNiMo Alloys

“…The PFR appears on TDIF curves of 24Ni5Mo alloys with carbon content more than Ccr > 0,04 wt.% at 250 (f = 2 Hz) or 360°C (0,7 kHz). The height of PFR increases with the increase of carbon content in the alloy [4]. The experimental PFR is broader than standard relaxation peak with single relaxation time ( Fig.…”

“…The excistence of two types of martensitic transformation kinetics has been shown using 24Ni5Mo alloy [1,2]. Kinetics of martensitic transformation and martensite structure depend on the state of initial y-phase and on the presence of the interstitials in solid solution [3,4]. Investigations of phase transitions and relaxation processes by the internal friction method in 24Ni5Mo with different carbon content provide the possibility of determining anelastic phenomena, connected with carbon distribution in alloyed austenite 141, and to find out mutual connection between y-solid solution structure and martensite, formed during the subsequent y-a transformation at lower temperatures.…”

The Contribution of Dislocation - Impurities Interaction to Kinetics of Martensitic Transformation of Quenched f.c.c. Fe-Ni-Mo Alloys

“…The study of dislocation motion induced by MT was done in [6-81. Still no one pays attention to the very simple point that the dislocation mobility and correspondingly the stress relaxation in austenite depend on the dislocation-interstitial interaction. Using the well known possibilities of the internal friction method [9,10] for dislocation-interstitials interaction study, the influence of carbon content in Fe-Ni-Mo and its redistribution on the type of MT has been taken as the subject for this paper.…”