Mathematical Model of the Thermoelasticity of the Surface Layer of Parts During Discontinuous Friction Treatment

Gurey, Volodymyr; Shynkarenko, H. А.; Kuzio, Igor

doi:10.1007/978-3-030-77823-1_2

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…The heating rate reaches 5.0•10 5 -1.5•10 6 K/s. The surface layers of the metal are heated to temperatures above the point of phase transformation (Ас3), cooling occurs at high speeds (5.0•10 5 -1.5•10 6 K/s) due to heat dissipation into the part [17]. And the nonequilibrium state of the metal is obtained.…”

Section: Methodsmentioning

confidence: 99%

Formation of Residual Stresses during Discontinuous Friction Treatment

Hurey

Gurey

Bartoszuk

et al. 2021

JES

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The tool with grooves on its working surface is used to improve the properties of the strengthened layer. This allows us to reduce the structure’s grain size and increase the thickness of the layer and its hardness. Mineral oil and mineral oil with active additives containing polymers are used as a technological medium during friction treatment. It is shown that the technological medium used during the friction treatment affects the nature of the residual stresses’ distribution. Thus, when using mineral oil with active additives containing polymers, residual compressive stresses are more significant in magnitude and depth than when treating mineral oil. The nature of the residual stresses diagram depends on the treated surface’ shape. After friction treatment of cylindrical surfaces, the highest compressive stresses near the treated surface decreases with depth. And after friction treatment of flat surfaces near the treated surface, the compressive stresses are small. They increase with depth, pass through the maximum, and then decrease to the original values. The technological medium used during friction treatment affects residual stresses in the grains and in the crystal lattice.

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Section: Methodsmentioning

confidence: 99%

Formation of Residual Stresses during Discontinuous Friction Treatment

Hurey

Gurey

Bartoszuk

et al. 2021

JES

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“…A metal tool is installed instead of a grinding wheel. A linear speed of 60-80 m/s is required for the formation of a highly concentrated energy source in the contact zone of the tool with the processed surface, as determined using mathematical modelling and a simulation and confirmed experimentally [37]. For this purpose, the modernization of the main drive of the machine spindle was carried out.…”

Section: The Technology Of Mptmentioning

confidence: 96%

The Mode Deformation Effect on Surface Nanocrystalline Structure Formation and Wear Resistance of Steel 41Cr4

et al. 2023

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A surface nanocrystalline steel layer in the low alloy steel 41Cr4 was fabricated by using mechanical-pulse treatment (MPT) with different deformation modes. The structure parameters, the physical and mechanical properties, the wear resistance, and the surface topography parameters of the treated steel depending on the deformation mode were investigated. A tool with a smooth working surface was used for inducing unidirectional deformation in the top surface layer (shear), and a tool with the oppositely directed grooves was used for generating multidirectional deformation. The surface layer with a nanocrystalline structure formed by MPT using both of the tools was characterised by enhanced mechanical properties and wear resistance compared with those of the untreated or heat-treated steels. Inducing multidirectional deformation during the MPT resulted in a decrease in the grain size and an increase in the depth and microhardness of the surface layer due to it facilitating the generation of dislocations compared to those formed under unidirectional deformation. The results also demonstrated that favourable surface topography parameters providing the highest wear resistance of the steel were obtained at MPT using multidirectional deformation.

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“…In these methods of processing under the influence of concentrated energy flows, small volumes of the surface layer of the metal are heated at a high rate to temperatures above the point of phase transformations [22,23]. After removing the heat source, the surface layers of the metal are cooled at a high rate by transferring the heat to the depth of the part [24,25]. Strengthened nanocrystal layers with specific physical, mechanical, and operational properties are formed in the surface layers of the metal.…”

Section: Of 18mentioning

confidence: 99%

Dynamic Analysis of the Thermo-Deformation Treatment Process of Flat Surfaces of Machine Parts

Gurey

Maruschak

Hurey

et al. 2023

JMMP

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Thermo-deformation treatment refers to methods of strengthening during which strengthened layers with a nanocrystalline structure are formed in the surface layers by modifying the metal surface layer, which changes its phase and structural and chemical compositions, reduces grain size, and improves performance. Grinding of the metal structure was achieved by combining two methods simultaneously during this treatment: the action of a highly concentrated energy source on the surface layer and intense plastic deformation. The source of highly concentrated energy was generated in the contact zone of the tool-disc, which rotates at high speed during friction on the treated surface. Intense deformation was achieved due to the grooves on the tool’s working surface. Dynamic analysis of the thermo-deformation treatment process of flat surfaces of machine parts and a calculation scheme of the surface grinder machine’s elastic system, which is the three-mass model, were developed. When the groove width increased from 4 mm to 8 mm, the force amplitude in the contact zone increased from 10 N to 75 N. Accordingly, the thickness of the nanocrystalline layer increased from 190–220 μm to 250–260 μm, and its hardness increased from 9.3 GPa to 11.1 GPa.

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Mathematical Model of the Thermoelasticity of the Surface Layer of Parts During Discontinuous Friction Treatment

Cited by 7 publications

References 19 publications

Formation of Residual Stresses during Discontinuous Friction Treatment

Formation of Residual Stresses during Discontinuous Friction Treatment

The Mode Deformation Effect on Surface Nanocrystalline Structure Formation and Wear Resistance of Steel 41Cr4

Dynamic Analysis of the Thermo-Deformation Treatment Process of Flat Surfaces of Machine Parts

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