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wheels” was formulated. It was approved by the General Directorate of Railway

Economy of Ukrzaliznytsia. The developed standards are the basis for the creation

of Specifications for high-strength railway wheels of a new generation.

3. Based on the study of the patterns of change in the resource

characteristics of wheel steels, it is recommended complex alloyed steel with solid-

4
solution (~ 1% Si and ~ 1% Mn) and precipitation ([V‧N]‧10 = 20…25%)
hardening at reduced carbon content (0.52… 0.53%) for pilot testing in order to

manufacture railway wheels of a new generation.

4. The recommendations for increasing fatigue crack growth resistance

of the heat affected zone of repair tread surface of railway wheels are substantiated

and included in the technical regulation of repair of railway wheels, developed in

the E.O.Paton Electric Welding Institute of the NAS of Ukraine.

5. The obtained research results are implemented in the educational

process of preparing bachelors and masters in the areas of 132 “Materials Science”

and 136 “Metallurgy” in the Department of Applied Materials Science and

Materials Engineering at Lviv Polytechnic National University.

Keywords: high-strength railway wheel steels, defects of the tread surface,

fatigue crack growth resistance, solid-solution and precipitation hardening,

operational reliability, repair of the tread surface.

Список опублікованих праць за темою дисертації:

Наукові праці, в яких опубліковані основні наукові результати

дисертації:

1. Andreiko I.M., Kulyk V.V. Temperature dependence of mechanical

characteristics of wheel steels. Materials Science. 2011. Vol. 47, No 1. P. 124-126.

(Scopus, Web of Science)

2. Andreiko I.M., Kulyk V.V., Ostash O.P. Resistance of steels of

railroad wheels to corrosion-fatigue fracture. Materials Science. 2011. Vol. 47,

No 5. P. 608-612. (Scopus, Web of Science)