Resistance of surface nanostructures and ultrafine grain structures on steel 40Kh to wear and cavitation-erosive destruction

Kyryliv, Yaroslav; Kyryliv, V. І.; Ціж, Б.; Maksymiv, Olha

doi:10.1007/s13204-021-01751-5

Cited by 2 publications

(1 citation statement)

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“…The increase in the wear resistance of friction pairs after the MPT and the decrease in friction coefficients and temperature in the sliding zone can be explained by the formation of a strengthened surface layer with the NCS. Grinding the structure of the strengthened layer to the nanoscale, changing the phase and chemical composition [11], stress state, and increasing the microhardness, etc., contributed to the enhancement of the operational characteristics and, in this case, the wear resistance of the friction pairs [41,42]. High-quality, continuous secondary structures were formed on the contact surfaces of the strengthened layers with the NCS during friction, as demonstrated in [43], which lead to decreases in the temperature and in the coefficient of friction in the sliding zone and to an increase in the wear resistance of the friction pair as a whole.…”

Section: Resultsmentioning

confidence: 91%

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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