| Реферат |
It was considered the treatment of metal surfaces and the application of functional coatings with a flexible tool - rotating wire brushes. This process, called friction cladding, is realized on metal cutting machines with using of simple rigging or manual angle grinders. Experiments have been conducted on the applying of perforator peen for plastic deformation of the surface layer with subsequent application of functional coatings. Optical microscopes Epikvant (Carl Zeiss, Germany), Epityp-2 (Carl Zeiss, Jena, Germany), IM7000 (Meiji Techno) and REM scanning microscope JSM-6490 LV (Jeol, Japan) were used for the metallographic studies. Surface microtopography studies were carried out on the optical profilometer “Contour GT K” 1 (Bruker, Germany). The minimal thickness of the coatings the resulting friction cladding was 10-12 microns, the maximum thickness was 40-45 microns. Dimensions of crystallites of aluminum and brass coatings do not exceed 100 nm. The microhardness of the coating (~ 6800 MPa) exceeds the microhardness of the steel basis three times. It is revealed that for strengthening and nanostructuring of the surface layer, it is expedient to use sectional brushes that have not only a frictional effect, but also an impact. Microanalysis has shown that in the microstructure of the surface layer, deformation bands consisting of elongated ferrite grains are formed with the formation of fragments up to 0.13 μm in size. Such a layer can be conditionally atributed to an amorphous or nanostructured layer. In all modes of processing by peen, hardening is observed on the surface of the specimens with respect to the base metal from 42 to 83%. The deepness, of the hardened layer is from 200 to 350 μm. The considered and studied technologies of surface modification can find practical application for increasing the service characteristics of metallurgical and other technological equipment. |
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