The Finkelshtain-Rosin effect in deformed f.c.c. steels
Faculty of Applied Economics
Engineering sciences. Technology
Journal of alloys and compounds. - Amsterdam
12th International Conference on Internal Friction and Ultrasonic, Attenuation in Solids (ICIFUAS-12), JUL 19-23, 1999, BUENOS AIRES, ARGENTINA
, p. 418-422
University of Antwerp
Experimental data on effect of plastic deformation on the carbon internal friction peak in austenitic steels (Finkelshtain-Rosin peak) were analysed and it was shown that the general regularity is that peak height increases whereas the peak temperature is rather stable, or decreases. To explain this effect the computer simulation of temperature dependence of internal friction was performed in a model crystal without and with a screw dislocation taking into account long-range C-C and C-Ni interaction and C-dislocation interaction. The last one was calculated by the so-called 'hybrid' method. It was shown that the elastic field around a dislocation enhances the asymmetry of metal atom displacements around interstitial atoms and, thus, increases the height of the peak. On the other hand, the weak energy for carbon-dislocation interaction in the f.c.c. lattice does not lend to significant changes in carbon atom energies. Thus, the corresponding value of the activation energy for carbon atom 'diffusion under stress' remains nearly the same as for the nondeformed alloy. For the same reason, there is no additional internal peak in austenite, in contrast with the Snoek-Koster peak in ferrite. (C) 2000 Elsevier Science S.A. All rights reserved.