Chemical nano-scale homogeneity of austenitic CrMnCN steels in relation to electronic and magnetic properties

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...

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Bibliographic Details
Published in:Journal of materials science 2011-12, Vol.46 (24), p.7725-7736
Main Authors: Shanina, B. D., Tyshchenko, A. I., Glavatskyy, I. N., Runov, V. V., Petrov, Yu N., Berns, H., Gavriljuk, V. G.
Format: Article
Language:English
Subjects:
Alloying elements
Austenitic stainless steels
Carbon
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Conduction electrons
Crystallography and Scattering Methods
Dislocations
Electron paramagnetic resonance
Electron spin
Electronics
Electrons
Ferromagnetism
Homogeneity
Magnetic moments
Magnetic properties
Magnetism
Magnetization
Materials Science
Nanostructure
Neutron scattering
Nitrogen
Organic chemistry
Polymer Sciences
Resonance scattering
Solid Mechanics
Spin resonance
Stacking fault energy
Steels
Temperature dependence
Transmission electron microscopy
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Summary: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.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-011-5752-9