Structure and tribological characteristics of steel under melting by plasma flow and simultaneous Mo and W alloying |
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| Authors: | S N Bratushka Yu N Tyurin O V Kolisnichenko A D Mikhalev R Yu Tkachenko N A Makhmudov A V Pshik R Denisenko I V Yakushchenko |
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| Affiliation: | 1.Sumy State University,Sumy,Ukraine;2.Paton Electric Welding Institute,National Academy of Sciences of Ukraine,Kiev,Ukraine;3.Samarkand Division of Tashkent Institute of Informatics,Samarkand,Uzbekistan |
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| Abstract: | New findings of studies of the structural, tribological, and physicomechanical characteristics of structural steel 40Kh treated
by plasma flow under melting accompanied by either tungsten or molybdenum alloying are presented. Rutherford back-scattering
of ions, scanning electron microscopy (with microanalysis), X-ray fluorescent spectral analysis, X-ray phase analysis, wear-resistance
tests, measurement of the coefficient of friction, and transmitting electron microscopy with diffraction are the basic research
methods. It is found experimentally that a thin layer 5 μm thick saturated with nitrogen and an alloying element (Mo or W)
with regularly arranged crystallites arises on the steel 40Kh surface. The crystallites in this layer have a needle- and ribbon-shaped
structure. A deeper layer located about 40 μm thick consists of micro- and nanosized grains. Friction and wear studies of
the plasma-flow treated (melt) samples show the steel wear resistance to increase 2–2.5 times and the coefficient of friction
to decrease from 0.4–0.5 to 0.10–0.15 compared to the untreated samples. |
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