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development of the method for modelling their operational degradation, which was

implemented in Affiliate “Prykarpattransgaz”.

The developed technique for assessment of the operational degradation of

steels of sucker rods of oil wells based on degree of susceptibility to corrosion-

fatigue failure was implemented in Oil and Gas Exploration and Production

Department “Dolynanaftogaz” of PJSC “Ukrnafta” for determination of causes of

fracture, substantiation of safe operation conditions and prolongation of life-time.

The method of diagnostics of in-service degradation of steels of metal structures by

their susceptibility to delamination was used in LLC Firm “Dialab” LTD for

substantiation of prolongation of their operational life.

Keywords: steel, corrosion, electrochemical properties, inhibitor,

hydrogenation, corrosion-mechanical fracture, corrosion fatigue, operation.

Список опублікованих праць за темою дисертації:

Наукові праці, в яких опубліковані основні наукові результати дисертації:

1. Kret N. V., Svirska L. M., Venhrynyuk T. P. Corrosion-fatigue crack

propagation in exploited pump rods made of 20N2M steel. Materials Science. 2020.

Vol. 56, No. 2. Р. 279–283. (Scopus, Web of Science)

2. Nykyforchyn H., Zvirko O., Tsyrulnyk O., Kret N. Analysis and

mechanical properties characterization of operated gas main elbow with hydrogen

assisted large-scale delamination. Engineering Failure Analysis. 2017. Vol. 82.

P. 364–377. (Scopus, Web of Science)

3. Zvirko O.I., Kret N.V., Tsyrulnyk O.T., Vengrynyuk T.P. Influence of

textures of pipeline steels after operation on their brittle fracture resistance.

Materials Science. 2018. Vol. 54, No. 3. Р. 400–405. (Scopus, Web of Science)

4. Zvirko O., Gabetta G., Tsyrulnyk O., Kret N. Assessment of in-service

degradation of gas pipeline steel taking into account susceptibility to stress corrosion

cracking. Procedia Structural Integrity. 2019. Vol. 16. Р. 121–125. (Scopus, Web of
Science)