Abstract
The research results of tribological characteristics of the surface hardened by electric explosion alloying of tungsten-cobalt hard alloys with carbon, titanium and aluminum are presented. The correlation of tribomechanical properties of the modified surface of alloys with changes in the structure and phase composition of the surface layer of the material is established. It is shown that the best wear characteristics are achieved during hardening of alloys by electric explosion of titanium. In this case, the coefficient of friction decreases by almost 3 times, the wear resistance estimated by the depth of the wear track increases by more than 10.0 times, and by the area of the wear track – by 53.2 times.
Highlights
The increase of durability and reliability of hard alloys can be achieved by technological methods in the process of their production, and by changing the properties of structural components of already sintered hard alloy products [1,2,3]
According to the results of electron microscopic, X-ray phase and durametric studies of the modified VK10KS alloy, it was found that with a single-component EEA with all exploding conductors in the surface layer of the alloy with a thickness of 15-40 μm, new high-solid phases consisting of elements of the base material and exploding conductors (TiC, W2C, Al2O3) are formed during crystallization
It is experimentally established that the treatment of a hard alloy VK10KS by a pulsed multiphase plasma jet formed from the material of the exploding conductor at a power density of 6.0 GW/m2 leads to the creation of a hardened layer up to 40 μm thick, consisting of finely dispersed high-hard carbides and/or oxides
Summary
The increase of durability and reliability of hard alloys can be achieved by technological methods in the process of their production, and by changing the properties of structural components of already sintered hard alloy products [1,2,3]. Processing of the materials surface with concentrated energy flows (laser, plasma, electron, ion implantation, etc.) in order to improve the level of material properties and create alloys with a new set of physical and mechanical properties is a promising way to modify the characteristics of machine parts and tools. Use of external energy impact to increase the level of material properties and create alloys with new physical and mechanical properties is intended for purposeful control of performance characteristics of hard alloy products. A reasonable choice of the most effective methods and specific modes of strengthening treatment of a material is impossible without the accumulation of experimental and theoretical data on changes in the structure in the irradiated layers and its influence on its properties
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