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structural steels, which combines nanostructuring and alloying of the surface layer,

was improved. Its practical capabilities were extended, since it enables control of

physical and mechanical properties of the treated surface layer. The usage of

mechanical-pulse treatment provided an increase in operational properties and

lifetime of components made of carbon and low alloyed steels under difficult

operating conditions, namely, the action of corrosive-hydrogenating media, contact

loads, abrasive or oil-abrasive wear.

The method of mechanical-pulse treatment with formation of surface

nanocrystalline structures was implemented at MCC “Lvivvodokanal”

(strengthening pump sleeves made of the 45 and 40X steel at sewage treatment

plants) and PJSC “Kohavynska Paperova Fabryka” (strengthening pump sleeves

made of the 45 and 40X steel at cellulose technological processing line) to increase

their service life, which ensured its growth in 2.5 – 3 times.

Keywords: nanocrystalline structure, mechanical-pulse treatment, friction

coefficient, mechanical properties, wear resistance, hydrogen embrittlement,

fatigue, corrosion fatigue, contact fatigue.

Список опублікованих праць за темою дисертації:

Наукові праці, в яких опубліковані основні наукові результати дисертації:

1. Nykyforchyn H., Kyryliv V., Maksymiv O. Physical and mechanical

properties of surface nanocrystalline structure generated by severe plastic

deformation. In: Fesenko O., Yatsenko L. (eds.). Nanocomposites, Nanophotonics,

Nanobiotechnology, and Applications. Springer Proceedings in Physics. Vol. 156.

Springer: Cham, 2015. P. 31–41. (Scopus)

2. Nykyforchyn H., Lunarska E., Kyryliv V., Maksymiv O. Influence of

hydrogen on mechanical properties of steels with the surface nanostructure. In:

Fesenko O., Yatsenko L. (eds.). Nanoplasmonics, Nano-Optics, Nanocomposites,

and Surface studies. Springer Proceedings in Physics. Vol. 167. Springer: Cham,

2015. P. 457–465. (Scopus)