J. Phys. IV France 112 (2003) 259
Thermodynamic stability, structure and properties of Fe-based C+N austenite and martensiteV.G. Gavriljuk1, A.I. Tyshchenko1, J. Rawers2 and H. Berns3
1 Institute for Metal Physics, Vernadsky Blvd. 36, Kiev 03142, Ukraine
2 Albany Research Center, U.S. Department of Energy, 1450 Queen Ave. SW, Albany, Oregon 97321, U.S.A.
3 Ruhr Universität Bochum, Chair of Materials Technology, Gebäude IA 2/152, 44780 Bochum, Germany
Atomic distribution in C+N austenites and martensites is studied using Mössbauer spectroscopy and Monte Carlo simulation. It is shown that interaction of interstitial atoms is characterised by a strong repulsion within the first two coordination spheres, so that they do not occupy neighbouring interstitial sites in the fcc as well as in the bcc lattice. Such behaviour is not typical either for nitrogen or for carbon atoms. A high stability of C+N solid solutions in relation to martensitic transformation and precipitation during tempering is found and attributed to these peculiarities of atomic distribution.
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