THE INFLUENCE OF LOW-TEMPERATURE PLASMA MODIFICATION WITH CARBON AND NITROGEN ON THE HARDENING AND SURFACE ROUGHNESS OF AUSTENITIC STAINLESS STEEL

  • Polina Skorynina Institute of Engineering Science of the Ural Branch of the Russian Academy of Sciences
  • Aleksey Makarov Institute of Engineering Science of the Ural Branch of the Russian Academy of Sciences, M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences
  • Andrey Menshakov Institute of Electrophysics of the Ural Branch of the Russian Academy of Sciences
  • Alevtina Osintseva Institute of Engineering Science of the Ural Branch of the Russian Academy of Sciences
  • Marina Chalina M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences
Keywords: austenitic stainless steel, plasma carburization, plasma nitriding, low-energy electron beam, microhardness, surface roughness

Abstract

Low-temperature plasma carburization and low-temperature plasma nitriding are the effective methods for hardening of thermally nonhardenable austenitic chromium-nickel steels. However, the ion-plasma methods of surface modification can lead to the roughness parameter increase. Previously, the authors identified that the level of surface roughness strongly depends on the temperature of plasma treatment. The hot topic of the research is the reduction of temperature of chemical and thermal treatment to ensure the effective hardening and low surface roughness of austenitic chromium-nickel steel.

In this paper, using the X-ray phase analysis, microhardness measurements at various loads and optical profilometry, the authors studied the influence of carburization and nitriding in the electron beam plasma at the temperature of T=350 °C on the phase composition, microhardness and surface roughness of 04Cr17Ni8Ti austenitic steel. It is established that carburization and nitriding in the plasma generated by low-energy electron beam provides an increase in microhardness of the surface of austenitic steel in 5–6 times (from 220 to 1100 HV and 1390 HV 0.025, respectively). The effective hardening of the surface layer of austenitic steel is associated with the formation as a result of low-temperature plasma modification of carbon-supersaturated austenite γC and chromium carbides Cr23C6 during carburization, as well as S-phase (nitrogen-supersaturated austenite γN), ε-phase (Fe2-3N) and γ¢-phase (Fe4N) during nitriding. The study identified that stainless austenitic steel after carburization is characterized by the greater depth of a hardened layer than in the case of plasma nitriding. Low-temperature (at the temperature of T=350 °C) treatment in the plasma electron beam by carburization and nitriding provides the formation of a high-quality 04Cr17Ni8Ti steel surface with low values of roughness parameter Ra (185–265 nm) and, therefore, can be considered as a finishing operation during the surface hardening of austenitic steel.

Author Biographies

Polina Skorynina , Institute of Engineering Science of the Ural Branch of the Russian Academy of Sciences

junior researcher

Aleksey Makarov , Institute of Engineering Science of the Ural Branch of the Russian Academy of Sciences, M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences

Corresponding Member of RAS, Doctor of Sciences (Engineering), Head of Materials Science Department, Head of the Laboratory of Mechanical Properties

Andrey Menshakov , Institute of Electrophysics of the Ural Branch of the Russian Academy of Sciences

PhD (Engineering), researcher

Alevtina Osintseva , Institute of Engineering Science of the Ural Branch of the Russian Academy of Sciences

PhD (Engineering), senior researcher

Marina Chalina , M.N. Mikheev Institute of Metal Physics of the Ural Branch of the Russian Academy of Sciences

postgraduate student

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Published
2019-12-30
Section
Technical Sciences