Eurasian Journal of Physics and Functional Materials (Nov 2021)

Changing the structure and phasestates and the microhardness of the R6M5 steel surface layer after electrolytic-plasma nitriding

  • B. K. Rakhadilov,
  • Sh. R. Kurbanbekov,
  • M. K. Kilishkhanov,
  • A. B. Kenesbekov,
  • S. .. Amanzholov

DOI
https://doi.org/10.29317/ejpfm.2018020307
Journal volume & issue
Vol. 2, no. 3
pp. 259 – 266

Abstract

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The article examines the changes of the structural-phase states and the microhardness of the R6M5 steel surface layer after electrolytic-plasma nitriding. It is found that after electrolytic-plasma nitriding of the R6M5 steel surface, diffusion layer is formed, which is a nitrogen martensite. The phase composition of the diffusion layer varies depending on the nitriding temperature. An increase of R6M5 steel microhardness, depending on structural-phase state, is found out. The main factor, in fluencing the increase of microhardness of R6M5 high-speed steel with electrolytic-plasma nitriding, is the formation of nitro . gen martensite with monophasic nitride Fe4N ( γ-phase), as well as the formation of fine inclusions, hardening phases in the surface layers.

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