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Structural transformations in metals and alloys induced by impulse treatment
Abstract
The effect of impulse treatment on structure of model alloys (low-carbon steel, technical iron), structural and tool steels is studied. Impulse effect is realized by shock waves with 200-1500 Hz frequency. Mechanical properties and microstructure of the samples before and after impulse treatment are determined. It is shown that impulse treatment increases steels strength, providing the viscosity is maintained or somewhat increased. The impulse treatment is shown to result in sufficient grain refinement. Under the given treatment microplastic deformation of materials is to take place.
The paper considers the possibility to control the restoration and wear processes during friction depending on the location of magnetic poles using electromagnetic techniques. It is shown that both the steel piston and copper cylinder can be restored in the magnetic field separately (without disassembling the mechanism). A method is developed for restoring the friction surfaces in oil modified with different magnetic powders in a pulsed magnetic field. The influence of a pulsed magnetic field on the tribological characteristics of the friction couple in oil with different magnetic nanopowders is analyzed to reveal that the surfaces are the most functional in S/N pulsed magnetic field.
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