Format

Send to

Choose Destination
Materials (Basel). 2019 Feb 5;12(3). pii: E491. doi: 10.3390/ma12030491.

Mechanical Properties of Gas Main Steels after Long-Term Operation and Peculiarities of Their Fracture Surface Morphology.

Author information

1
Department of Machine Design, Military University of Technology, Gen. S. Kaliskiego str. 2, 00-908 Warsaw, Poland. volodymyr.hutsaylyuk@wat.edu.pl.
2
Department of Industrial Automation, Ternopil National Ivan Pul'uj Technical University, Rus'ka str. 56, 46001 Ternopil, Ukraine. maruschak.tu.edu@gmail.com.
3
Department of Industrial Automation, Ternopil National Ivan Pul'uj Technical University, Rus'ka str. 56, 46001 Ternopil, Ukraine. icxxan@gmail.com.
4
Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, 634055 Tomsk, Russia. svp@ispms.ru.
5
Department of Welding, Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Karpatska str. 15, 76019 Ivano-Frankivsk, Ukraine. bishchakr@gmail.com.
6
Department of Mechanics, National University of Life and Environmental Sciences of Ukraine, Heroiv Oborony str.15, 03041 Kyiv, Ukraine. m.g.chausov@gmail.com.

Abstract

Regularities of steel structure degradation of the "Novopskov-Aksay-Mozdok" gas main pipelines (Nevinnomysskaya CS) as well as the "Gorky-Center" pipelines (Gavrilovskaya CS) were studied. The revealed peculiarities of their degradation after long-term operation are suggested to be treated as a particular case of the damage accumulation classification (scheme) proposed by prof. H.M. Nykyforchyn. It is shown that the fracture surface consists of sections of ductile separation and localized zones of micro-spalling. The presence of the latter testifies to the hydrogen-induced embrittlement effect. However, the steels under investigation possess sufficiently high levels of the mechanical properties required for their further safe exploitation, both in terms of durability and cracking resistance.

KEYWORDS:

failure; gas mains steel; long-term operation; static cracking resistance

Supplemental Content

Full text links

Icon for Multidisciplinary Digital Publishing Institute (MDPI) Icon for PubMed Central
Loading ...
Support Center