The structure and phase composition of the U9 steel surface layer alloyed with chromium atoms under the action of compression plasma flows

Authors

  • Nikolai N. Cherenda Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
  • Alexander A. Malashevich Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
  • Vladimir V. Uglov Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
  • Valentin M. Astashynski A. V. Luikov heat and mass transfer Institute of the National Academy of Sciences of Belarus, 15 P. Broŭki Street, Minsk 220072, Belarus
  • Anton M. Kuzmitski A. V. Luikov heat and mass transfer Institute of the National Academy of Sciences of Belarus, 15 P. Broŭki Street, Minsk 220072, Belarus

Keywords:

compression plasma flows, structural and phase changes, alloying, instrumental steel

Abstract

In this work, the elemental and phase compositions as well as mechanical properties of the instrumental U9 steel surface layer alloyed with chromium atoms under the action of compression plasma flows, generated by the magnetoplasma compressor of compact geometry, were investigated. X-ray diffraction analysis, scanning electron microscopy, energy dispersion microanalysis, and microhardness measurements were used to study the modified layer structure and properties. The findings show that an increase of the energy density absorbed by the surface leads to growth of the alloyed layer thickness and to the increased surface erosion intensity and hence results in a decrease of the chromium concentration in this layer. X-ray diffraction analysis reveals the presence of the metastable γ-Fe phase in the alloyed layer. Existence of the metastable phase can be explained by its stabilization with the nitrogen atoms diffused from the residual atmosphere of the vacuum chamber. The concentration of this phase is depending on the treatment parameters. The formation of the surface layer dispersed structure leads to increase of the microhardness by a factor of two and more.

Author Biographies

  • Nikolai N. Cherenda, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

    PhD (physics and mathematics); associate professor at the department of solid state physics, faculty of physics

  • Alexander A. Malashevich, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

    masterʼs degree student at the department of solid state physics, faculty of physics

  • Vladimir V. Uglov, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

    doctor of science (physics and mathematics), full professor; head of the department of solid state physics, fa culty of physics

  • Valentin M. Astashynski, A. V. Luikov heat and mass transfer Institute of the National Academy of Sciences of Belarus, 15 P. Broŭki Street, Minsk 220072, Belarus

    doctor of science (physics and mathematics); deputy director for research

  • Anton M. Kuzmitski, A. V. Luikov heat and mass transfer Institute of the National Academy of Sciences of Belarus, 15 P. Broŭki Street, Minsk 220072, Belarus

    senior researcher

References

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  4. Cherenda N. N., Shimanskii V. I., Uglov V. V., et al. Nitriding of steel and titanium surface layers under the action of compression plasma flows. J. Surf. Investig. X-ray, Synchrotron and Neutron Techniques. 2012. Vol. 6, issue 2. P. 319–325. DOI: 10.1134/ S1027451012040088.
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Published

2017-05-30

Issue

No. 2 (2017): Journal of the Belarusian State University. Physics

Section

Condensed State Physics

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How to Cite

(1)
Cherenda, N. N.; Malashevich, A. A.; Uglov, V. V.; Astashynski, V. M.; Kuzmitski, A. M. The Structure and Phase Composition of the U9 Steel Surface Layer Alloyed With Chromium Atoms under the Action of Compression Plasma Flows. Журнал Белорусского государственного университета. Физика 2017, No. 2, 102-107.