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Small‐angle neutron scattering investigation of plastically deformed stainless steel
Author(s) -
Lebedev Vassily,
Didenko Vitaly,
Lapin Alexander,
Konoplev Kir,
Orlova Diana,
Török Gyula,
Rétfalvi Eszter
Publication year - 2003
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889803003996
Subject(s) - materials science , small angle neutron scattering , scattering , fractal dimension , neutron scattering , fracture (geology) , neutron , deformation (meteorology) , small angle scattering , austenite , intensity (physics) , crystallography , fractal , composite material , optics , nuclear physics , microstructure , chemistry , physics , mathematical analysis , mathematics
The microstuctural evolution of plastically deformed steels has been studied by small‐angle neutron scattering at ambient temperature in the range of momentum transfer q = (4π/λ)sin(θ/2) = 0.01–5 nm −1 where λ is neutron wavelength and θ is the scattering angle. Samples of austenite stainless steels were pulled on a standard bench to cause a plastic deformation, S = 0–60%, up to the fracture of the material. As a result of the deformation an increase of an order of magnitude was observed in the scatterred intensity I ( q )~1/[ 1 +( qR C ) 2 ] (6‐ D s )/2 . The analysis of the I ( q ) distribution has shown the surface fractal nature of the observed nano‐scale structures. The evolution of internal surface via intensive growth of pores (size R C ~20–40 nm) was found and a linear decrease of the surface fractal dimension 2.9≥ D s ( S )≥2.1 was observed. These findings can be used to design the fracture criteria for materials of industrial application.