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The paper studies the effect of ion nitriding in a glow discharge on the structure and mechanical properties of R6M5 steel obtained by the method of traditional hot thermomechanical treatment and subsequent severe plastic deformation (SPD). It is found out that the surface microhardness of material increases significantly (~ 1.7 times) as a result of ionic nitriding after SPD and for the sample without SPD an increase is twice as much times in the line region of carbide-nitride inclusions. It is proved that the microhardness distribution over the diffusion zone depth in the sample after the SPD is smoother, and the thickness of the diffusion layer exceeds almost 2 times.

Ion nitriding effect on the structure and mechanical properties of R6M5 high-speed steel after SPD