Electron-beam modification of diffusion boride layers on the surface of 5KhNM steel
U.L. Mishigdorzhiyn1, S.A. Lysykh1, A.S. Milonov1, Yu.I. Semenov2, M.Yu. Kosachev2, A.A. Starostenko2, V.N. Kornopoltsev3
1Physical Material Science Institute, Siberian Branch, Russian Academy of Sciences, Ulan-Ude, Russia
2Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
3Baikal Institute of Nature Management of the Siberian Branch of the Russian Academy of Sciences, Ulan-Ude, Russia
Email: undrakh@ipms.bscnet.ru
The present study provides results of surface hardening of samples made of the 5KhNM alloyed steel by complex saturation with boron and copper (borocoppering) to be followed by electron bean modification. The microstructure, the microhardness, the elemental and phase composition of the steel samples have been studied after complex borocoppering and subsequent electron-beam processing. It is shown that impact of the electron beam substantially increases the thickness of a boride layer, results in transition from a needle structure of the layer to a fined-grained submicron structure as well as to reduction of the microhardness and increase of layer plasticity. The X-ray diffraction analysis has revealed absence of the high-boron FeB and Cr2B5 phases after the electron-beam processing. The X-ray spectral microanalysis concluded that the boron content in the layer reduced from 16 to 6 wt.%, while the copper content, vice versa, increases from 2.6 to 4 wt.% along the direction from the surface. Keywords: borocoppering, electron-beam processing,alloyed steel, microhardness, metallography, plasticity.
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