Results of approbation of the innovative method of ion nitriding for steels with low temperatures of tempering

Authors

  • Anatoly Andreev National Science Center Kharkov Institute of Physics and Technology Akademichna str., 1, Kharkiv, Ukraine, 61108, Ukraine
  • Oleg Sоbоl National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-4497-4419
  • Svitlana Shevchenko National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine
  • Vyacheslav Stolbovoy National Science Center Kharkov Institute of Physics and Technology Akademichna str., 1, Kharkiv, Ukraine, 61108, Ukraine
  • Viktor Aleksandrov National Science Center Kharkov Institute of Physics and Technology Akademichna str., 1, Kharkiv, Ukraine, 61108, Ukraine
  • Dmitriy Kovteba National Science Center Kharkov Institute of Physics and Technology Akademichna str., 1, Kharkiv, Ukraine, 61108, Ukraine
  • Alexander Terletsky National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0002-5948-9934
  • Tatyana Protasenko National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002, Ukraine https://orcid.org/0000-0001-6045-685X

DOI:

https://doi.org/10.15587/1729-4061.2017.104179

Keywords:

ionic nitriding, complex treatment, diffusion, depth of impact, diffraction spectra

Abstract

The innovation technique of complex treatment for steels with the low temperature of tempering is proposed and tested in the course of present study. It includes nitriding in the vacuum gas discharge before hardening and tempering. In this case, during nitriding, the heating temperature influences little the process of high-temperature treatment. In this case, the process of diffusion of nitrogen atoms is accelerated considerably (since nitrogen atoms penetrate untempered steel more easily), which leads to an increase to 2000 µm in the depth of penetration of nitrogen atoms and in the thickness of the formed region with changed structure and hardness. It was established that, according to the properties, the region of exposure is divided into a surface layer (with a thickness of about 200 µm) with lowered hardness and the deeper operating layer with enhanced hardness. Layer with the greatest hardness is at depth of 400–800 µm. In this case, enhanced hardness, in comparison with the base, is maintained at depth that exceeds 2000 µm. The surface layer with low hardness makes it possible to implement the allowance for finishing, in order to obtain the required accuracy of dimensions and surface finish. Hardness of the surface of articles after this sequence of operations for the steels with low temperature of tempering is at the level of 8–10 GPa. The phase composition of the nitrided layer with high hardness, detected by the X-ray diffraction method, is the lowest nitride Fe4N and the solution of nitrogen in α-Fe

Author Biographies

Anatoly Andreev, National Science Center Kharkov Institute of Physics and Technology Akademichna str., 1, Kharkiv, Ukraine, 61108

Doctor of Technical Sciences

Oleg Sоbоl, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Doctor of Physics and Mathematics Sciences, Professor

Department of Materials Science

Svitlana Shevchenko, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Senior Lecturer

Department of Materials Science

Vyacheslav Stolbovoy, National Science Center Kharkov Institute of Physics and Technology Akademichna str., 1, Kharkiv, Ukraine, 61108

PhD, Head of Laboratory

Viktor Aleksandrov, National Science Center Kharkov Institute of Physics and Technology Akademichna str., 1, Kharkiv, Ukraine, 61108

Engineer

Dmitriy Kovteba, National Science Center Kharkov Institute of Physics and Technology Akademichna str., 1, Kharkiv, Ukraine, 61108

Junior Researcher

Alexander Terletsky, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

PhD, Associate Professor

Department of Materials Science

Tatyana Protasenko, National Technical University "Kharkiv Polytechnic Institute" Kyrpychova str., 2, Kharkiv, Ukraine, 61002

Associate professor

Department of Materials Science

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Published

2017-06-30

How to Cite

Andreev, A., Sоbоl O., Shevchenko, S., Stolbovoy, V., Aleksandrov, V., Kovteba, D., Terletsky, A., & Protasenko, T. (2017). Results of approbation of the innovative method of ion nitriding for steels with low temperatures of tempering. Eastern-European Journal of Enterprise Technologies, 3(5 (87), 31–36. https://doi.org/10.15587/1729-4061.2017.104179

Issue

Vol. 3 No. 5 (87) (2017): Applied physics

Section

Applied physics

License

Copyright (c) 2017 Anatoly Andreev, Oleg Sоbоl, Svitlana Shevchenko, Vyacheslav Stolbovoy, Viktor Aleksandrov, Dmitriy Kovteba, Alexander Terletsky, Tatyana Protasenko

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