EVALUATION OF STRENGTH AND FRACTURE RISK OF PIPELINE UNDER ACTION OF HYDROGEN-CONTAINED ENVIRONMENTS

Authors

  • Андрей Михайлович Сыротюк Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, Lviv, Ukraine
  • Игорь Николаевич Дмытрах Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, Lviv, Ukraine

DOI:

https://doi.org/10.20535/2305-9001.2014.70.33629

Keywords:

low alloyed pipeline steel, hydrogen-contained environments, hydrogen charging of metal, hydrogen concentration, stress concentrators

Abstract

The work is dedicated to the evaluation of strength and risk of fracture of pipeline under action of gaseous hydrogen or potentially hydrogen-contained environments.

Purpose. Determining of the hydrogen effect on local strength and fracture risk of pipe with stress concentrators.

Design/methodology/approach. The low-alloyed steel X52 with the dominant pearlite-ferrite structure, which is the most usable in the existed gas pipelines, was studied by the combination of methods of mechanics of materials, physical chemistry and materials science.

Findings. The dependencies of the work for local fracture initiation from stress concentrator as well as the total work for notched specimen fracture were determined as the function of the hydrogen concentration in the bulk of metal.

Originality/value. The existence of some critical hydrogen concentration , at which the essential decreasing of steel fracture resistance occurs, has been shown. This value can be considered as an important engineering parameter for strength and fracture assessment of materials and structural components in hydrogenous environments.

Author Biographies

Андрей Михайлович Сыротюк, Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, Lviv

канд. техн. наук, старший научный сотрудник отдела физических основ разрушения и прочности материалов Физико-механического института им. Г.В. Карпенка НАН Украины

Игорь Николаевич Дмытрах, Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, Lviv

член-корреспондент НАН Украины, д-р техн. наук, профессор, заведующий отделом физических основ разрушения и прочности материалов Физико-механического института им. Г.В. Карпенка НАН Украины

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Published

2014-11-15

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