Shanina, B.D.; Tyshchenko, A.I.; Glavatskyy, I.N.; Runov, V.V.; Petrov, Yu.N.; Berns, H.; Gavriljuk, V.G.: Chemical nano-scale homogeneity of austenitic CrMnCN steels in relation to electronic and magnetic properties. Journal of Materials Science 46 (2011), p. 7725-7736
10.1007/s10853-011-5752-9
Abstract:
Measurements of conduction electron spin resonance, temperature-dependent magnetization, small angle neutron scattering, and transmission electron microscopy were used for the analysis of chemical nonhomogeneity in austenitic steels with carbon + nitrogen or carbon only. It is shown that all studied steels are characterized by a nonhomogeneous distribution of alloying elements on the fine scale: from 3 to 5 nm in CrMnCN steels to about 30 nm in MnC Hadfield type steel. In the CN steels, their chemical homogeneity is improved by decreasing the C/N ratio. A ferromagnetic-type temperature behavior is observed in the CN steels at temperatures below 86 K, which is attributed to the blocking of magnetic moments of superparamagnetic clusters. The short-range decomposition of all studied steels results in a different splitting of dislocations, which corresponds to two different values of the stacking fault energy.