Study of the effect of ion nitriding regimes on the structure and hardness of steel

Authors

  • Oleg Sobol National Technical University "Kharkiv Polytechnic Institute" 21 Frunze str., Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0001-5156-7371
  • Anatoly Andreev Kharkiv Institute of Physics and Technology 1 Akademicheskaya str., Kharkiv, Ukraine, 61108, Ukraine
  • Vyacheslav Stolbovoy Kharkiv Institute of Physics and Technology 1 Akademicheskaya str., Kharkiv, Ukraine, 61108, Ukraine
  • Sergey Knyazev National Technical University "Kharkiv Polytechnic Institute" 21 Frunze str., Kharkiv, Ukraine, 61002, Ukraine
  • Alexander Barmin National Technical University "Kharkiv Polytechnic Institute" 21 Frunze str., Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0001-7507-7596
  • Natalya Krivobok National Technical University "Kharkiv Polytechnic Institute" 21 Frunze str., Kharkiv, Ukraine, 61002, Ukraine

DOI:

https://doi.org/10.15587/1729-4061.2016.63659

Keywords:

ion nitriding, austenitic, S phase, chromium nitride, diffraction spectra, hardness

Abstract

Application of low-temperature plasma nitriding of non-self-sustained arc low-pressure discharge allows solving a critical problem of increasing the stainless steel hardness and getting a wide range of structural states, including metastable at low temperatures, such as the S-phase (nitrided austenite).

Using ion nitriding at a pressure of PN=(4…40)·10-4 Torr and constant negative potentials –600, –900 and –1300 V, the possibilities of structural engineering in the ion-induced surface modification and its influence on hardness are examined.

When using ion nitriding regimes, the S-phase formation at the lowest pressure is revealed, the grating spacing of 0.381 nm is determined, which corresponds to the formula FeN0,4, and a large width of the diffraction reflections of the S-phase evidences fragmentation and high microstrain of the initial austenite in the S-phase formation. It is shown that the highest hardness can be obtained when the composition of CrN, S and the original austenitic phase is formed in the nitriding process, which is achieved under the following nitriding regimes: the pressure of 4·10-3 Torr and relatively low negative bias potential of 600 V.

Author Biographies

Oleg Sobol, National Technical University "Kharkiv Polytechnic Institute" 21 Frunze str., Kharkiv, Ukraine, 61002

Doctor of physical and mathematical sciences, Рrofessor, Head of the Department

Department of materials science

Anatoly Andreev, Kharkiv Institute of Physics and Technology 1 Akademicheskaya str., Kharkiv, Ukraine, 61108

Doctor of Technical Sciences, Senior Researcher

National Science Center

Vyacheslav Stolbovoy, Kharkiv Institute of Physics and Technology 1 Akademicheskaya str., Kharkiv, Ukraine, 61108

PhD, Researcher

National Science Center

Sergey Knyazev, National Technical University "Kharkiv Polytechnic Institute" 21 Frunze str., Kharkiv, Ukraine, 61002

Engineer

Department of materials science

Alexander Barmin, National Technical University "Kharkiv Polytechnic Institute" 21 Frunze str., Kharkiv, Ukraine, 61002

PhD, Associate Professor

Department of materials science

Natalya Krivobok, National Technical University "Kharkiv Polytechnic Institute" 21 Frunze str., Kharkiv, Ukraine, 61002

Research engineer II category

Department of materials science

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Published

2016-04-25

How to Cite

Sobol, O., Andreev, A., Stolbovoy, V., Knyazev, S., Barmin, A., & Krivobok, N. (2016). Study of the effect of ion nitriding regimes on the structure and hardness of steel. Eastern-European Journal of Enterprise Technologies, 2(5(80), 63–68. https://doi.org/10.15587/1729-4061.2016.63659

Issue

Vol. 2 No. 5(80) (2016): Applied physics. Materials Science

Section

Materials Science

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Copyright (c) 2016 Anatoly Andreev, Oleg Sobol, Vyacheslav Stolbovoy, Sergey Knyazev, Alexander Barmin, Natalya Krivobok

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