Influence of Textures of Pipeline Steels after Operation on Their Brittle Fracture Resistance
- 5 Downloads
The difference between the brittle fracture resistances of ferrite-pearlite steels in the as-received state and after operation is determined, depending on the orientation of the specimens, by the impact toughness testing of Charpy specimens cut out in different directions relative to the axis of the pipe. The longitudinal specimens exhibit the highest level of impact toughness, the transverse specimens have a somewhat lower level impact toughness, and the radial specimens whose fracture plane is parallel to the rolling plane revealed the lowest impact toughness. The long-term operation of steels significantly decreases their brittle fracture resistance. In this case, the impact toughness of radial specimens was, as a rule, lower than the normative values specified in the industry.
Keywordspipe steels impact toughness in-service degradation influence of texture
The present research was partially supported by the NATO in the Science for Peace and Security Program under the Project G5055.
- 1.O. T. Tsyrul’nyk, E. I. Kryzhanivs’kyi, D. Yu. Petryna, O. S. Taraevs’kyi, and M. I. Hredil’, “Susceptibility of a welded joint of 17G1S steel in a gas main to hydrogen embrittlement,” Fiz.-Khim. Mekh. Mater., 40, No. 6, 111–114 (2004); English translation : Mater. Sci., 40, No. 6, 844–849 (2004).Google Scholar
- 3.O. T. Tsyrulnyk, V. A. Voloshyn, D. Yu. Petryna, M. I. Hredil, and O. I. Zvirko, Degradation of properties of the metal of welded joints in operating gas mains,” Fiz.-Khim. Mekh. Mater., 46, No. 5, 55–58 (2010); English translation : Mater. Sci., 46, No. 5, 628–632 (2011).Google Scholar
- 4.E. I. Kryzhanivs’kyi, R. S. Hrabovs’kyi, and O. M. Mandryk, “Estimation of the serviceability of oil and gas pipelines after longterm operation according to the parameters of their defectiveness,” Fiz.-Khim. Mekh. Mater., 49, No. 1, 105–110 (2013); English translation : Mater. Sci., 49, No. 1, 117–123 (2013).Google Scholar
- 6.Z. T. Nazarchuk (Ed.), Engineering Diagnostics of Materials and Structures, E. I. Kryzhanivs’kyi, O. P. Ostash, H. M Nykyforchyn, O. Z. Student, and P. V. Yasnii, Operative Degradation of Structural Materials [in Ukrainian], Vol. 1, Prostir-M, Lviv (2016).Google Scholar
- 7.O. T. Tsyrul’nyk, H. M Nykyforchyn, D. Yu. Petryna, M. I. Hredil’, and I. M. Dz’oba, “Hydrogen degradation of steels in gas mains after long periods of operation,” Fiz.-Khim. Mekh. Mater., 43, No. 5, 97–104 (2007); English translation : Mater. Sci., 43, No. 5, 708–717 (2007).Google Scholar
- 8.E. V. Kharchenko, O. Z. Student, and H. V. Chumalo, “Influence of the degradation of 17G1S steel on its properties after operation in the gas main,” Fiz.-Khim. Mekh. Mater., 53, No. 2, 72–79 (2017); English translation : Mater. Sci., 53, No. 2, 207–215 (2017).Google Scholar
- 9.H. V. Krechkovs’ka and O. Z. Student, “Determination of the degree of degradation of steels of steam pipelines according to their impact toughness on specimens with different geometries of notches,” Fiz.-Khim. Mekh. Mater., 52, No. 4, 106–110 (2016); English translation : Mater. Sci., 52, No. 4, 566–571 (2017).Google Scholar
- 10.L. E. Kharchenko, O. E. Kunta, O. I. Zvirko, and R. S. Savula, “Diagnostics of hydrogen macrodelamination in the wall of a bent pipe in the system of gas mains,” Fiz.-Khim. Mekh. Mater., 51, No. 4, 84–90 (2015); English translation : Mater. Sci., 51, No. 4, 530–537 (2016).Google Scholar
- 11.O. I. Zvirko, A. B. Mytsyk, O. T. Tsyrulnyk, G. Gabetta, and H. M. Nykyforchyn, “Corrosion degradation of steel of an elbow of gas pipeline with large-scale delamination after long-term operation,” Fiz.-Khim. Mekh. Mater., 52, No. 6, 104–108 (2016); English translation : Mater. Sci., 52, No. 6, 861–865 (2017).Google Scholar