State of Ni–Cr–B–Si–Fe/WC coatings after plasma powder surfacing with nanopowder modifier

The structure and phase state and internal stress fields of plasma powder Ni–Cr–B–Si–Fe/WC surface coatings are compared in the presence and absence of a modifier: Al 2 O 3 nanoparticles. PS-12NVK-01 powder alloy applied to a steel 20 substrate is studied by transmission diffraction electron microsc...

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Bibliographic Details
Published in:Steel in translation 2016-04, Vol.46 (4), p.251-255
Main Authors: Smirnov, A. N., Kozlov, E. V., Radchenko, M. V., Knyaz’kov, K. V., Knyaz’kov, V. L.
Format: Article
Language:English
Subjects:
Carbides
Chemistry and Materials Science
Coatings
Low carbon steels
Materials Science
Nanostructure
Nickel
Residual stress
Scanning electron microscopy
Structural steels
Tungsten carbide
X-rays
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Summary:The structure and phase state and internal stress fields of plasma powder Ni–Cr–B–Si–Fe/WC surface coatings are compared in the presence and absence of a modifier: Al 2 O 3 nanoparticles. PS-12NVK-01 powder alloy applied to a steel 20 substrate is studied by transmission diffraction electron microscopy of thin films, scanning electron microscopy, and X-ray structural and local X-ray spectral analysis. The phase composition of the alloy is determined; its defect structure and internal stress are studied. The structure of the material is analyzed before and after the introduction of Al 2 O 3 nanopowder in the melt. Introducing the modifier reduces the grain size of the material; leads to the formation of tungsten carbide W 2 C and the boride Fe 3 Ni 3 B in the carbide subsystem; and reduces the internal stress and scalar dislocation density.
ISSN:0967-0912
1935-0988
DOI:10.3103/S0967091216040148