Electron beam modification of boride diffusion layers on the surface of steels 45 and U10

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Abstract

We present the results of surface hardening of samples made of steels 45 and U10 by complex saturation with boron and copper, as well as subsequent processing of the layer with an electron beam using a source with a plasma cathode in order to increase a number of physical and mechanical properties of boride layers, in particular ductility and wear resistance. A comparative analysis of the structure of the diffusion layer after borocoppering and subsequent modification of this layer with an electron beam was carried out. The morphology of the diffusion layer was analyzed. Microhardness, elemental and phase compositions were studied. The plasticity of the resulting diffusion layers was evaluated before and after electron beam processing.

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About the authors

S. А. Lysykh

Institute of Physical Materials Science SB RAS

Author for correspondence.
Email: lysyh.stepa@yandex.ru
Russian Federation, Ulan-Ude

P. V. Moskvin

Institute of High Current Electronics SB RAS

Email: lysyh.stepa@yandex.ru
Russian Federation, Tomsk

М. S. Vorobyov

Institute of High Current Electronics SB RAS

Email: lysyh.stepa@yandex.ru
Russian Federation, Tomsk

V. N. Kornopoltsev

The Baikal Institute of Nature Management SB RAS

Email: lysyh.stepa@yandex.ru
Russian Federation, Ulan-Ude

U. L. Mishigdorzhiyn

Institute of Physical Materials Science SB RAS

Email: lysyh.stepa@yandex.ru
Russian Federation, Ulan-Ude

Yu. P. Kharaev

East Siberia State University of Technology and Management SB RAS

Email: lysyh.stepa@yandex.ru
Russian Federation, Ulan-Ude

А. S. Milonov

Institute of Physical Materials Science SB RAS

Email: lysyh.stepa@yandex.ru
Russian Federation, Ulan-Ude

References

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Supplementary files

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2. Fig. 1. Scheme of processing in a pulsed electron-beam setup (a) and external appearance of the “SOLO” setup (ISE SB RAS) (b): 1 — plasma cathode; 2 — electron beam; 3 — lens; 4 — quartz glass; 5 — fiber optic cable; 6 — sample; 7 — thermocouple; 8 — manipulator table; 9 — multimeter; 10 — high-speed infrared pyrometer; 11 — oscilloscope.

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3. Fig. 2. Characteristic oscillograms of the discharge current Id (1) of the plasma cathode, the current in the accelerating gap circuit of the electron source Ig (2) and the output signal of the high-speed pyrometer T [°C] (3): T = 300 + 400ncells, where ncells is the number of cells.

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4. Fig. 3. SEM image of the diffusion layer of steels 45 (a) and U10 (b) after complex surface saturation with boron and copper.

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5. Fig. 4. SEM image of a sample of grade 45 steel after copper boron plating followed by electron beam treatment (a) and an enlarged area highlighted by a square (b).

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6. Fig. 5. SEM image of a U10 steel sample after copper boron plating followed by electron beam treatment (a) and an enlarged area highlighted by a square (b).

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7. Fig. 6. Distribution of microhardness of samples of steels 45 (1, 2) and U10 (3, 4) after chemical-thermal treatment (1, 3) and copper boron plating followed by electron beam treatment (2, 4).

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8. Fig. 7. Diffraction patterns of steel samples 45 (a) and U10 (b).

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9. Fig. 8. SEM images of steels 45 (a, c) and U10 (b, d) during measurement of ultimate ductility after: a – boriding; b – copper boron plating; c, d – copper boron plating followed by electron beam processing.

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