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

Number 3_Vol.2

AUTHORS: B.K. Rakhadilov, Sh.R. Kurbanbekov, M.K. Kilishkhanov, A.B. Kenesbekov

DOI: 10.29317/ejpfm.2018020307

PAGES: 259 - 266

DATE: 2018-09-26


ABSTRACT

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, influencing the increase of microhardness of R6M5 high-speed steel with electrolytic-plasma nitriding, is the formation of nitrogen martensite with monophasic nitride Fe4N (g′ - phase), as well as the formation of fine inclusions, hardening phases in the surface layers.


KEYWORDS

Microstructure, microhardness, nitriding, phase composition, high-speed steel.
 


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