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substantiation of terms for the next inspections of steam pipelines, and a sequence of

replacement of critically degraded elements.

Conclusions and recommendations formulated in this work have been used by

TPPs for finding out the causes of damage occurrence in structural elements, the

development of measures aimed at preventing damaging in the future, and also for

estimation of reliability of other installation components. It is confirmed by 8 acts of

use of the obtained results, conclusions and recommendations.

Keywords: degradation, structural steels, long-term operation, ambient and

high-temperature conditions, structural and fractographic signs, correlations,

fractographic and mechanical indicators, critical state substantiation.

Список опублікованих праць за темою дисертації:

Наукові праці, в яких опубліковані основні наукові результати дисертації:

1. Student О., Krechkovska H., Lesiuk G., Correia J. Features of the

microstructural and mechanical degradation of long term operated mild steel.

International Journal of Structural Integrity. 2018. Vol. 9, No 3. P. 296–306.

(Scopus, Web of Science).

2. Nykyforchyn H. M., Kutnyi A. O., Student O. Z., Krechkovs’ka H. V.,

Zvirko O. I., Kurnat I. M. Structure and properties of the steels of hyperboloid
gridshell Shukhov’s towers after long-term operation. Materials Science. 2014. Vol.

49, No 6. P. 787–795. (Scopus, Web of Science).
3. Student O. Z., Krechkovs’ka H. V, Palashchuk T. E., Hladkyi Ya. М.

Influence of the long-term operation of 12Kh1МF steel of the bends of main steam
pipelines of thermal power plants on its mechanical properties. Materials Science.

2018. Vol. 53, No 4. P. 460–467. (Scopus, Web of Science).

4. Krechkovs’ka H. V., Student O. Z., Nykyforchyn H. M. Diagnostics of the

engineering state of steam pipeline of thermal power plants by the hardness and crack

resistance of steel. Materials Science. 2019. Vol. 54, No 5. P. 627–637. (Scopus, Web

of Science).

5. Krechkovs’ka H. V, Student O. Z., Kutnyi A. I., Nykyforchyn H. M.