Mechanical, corrosion-mechanical and electrochemical parameters sensitive to corrosion-hydrogen degradation of structural steels under long - term in-service conditions

• Autorzy: Nykryforchyn H.
• Języki publikacji: EN

Abstrakty

EN

Some low-alloyed steels exploited for decades of years in corrosion-hydrogen environments, namely, power steam pipeline, reactor shell of oil hydrocracking, oil trunk pipeline, are considered. The essential decrease of mechanical (impact strength, creep), corrosion (corrosion rate) and corrosion-mechanical (stress corrosion cracking) properties of exploited metal to compare with that in the virgin state is demonstrated. Especially high sensitivity of fracture mechanics characteristics (effective range of stress intensity factor of fatigue crack growth [detlaKth eff], fracture toughness Jlc) to in-service degradation is shown. It is revealed that same electrochemical parameters (polarization resistance, corrosion current) are especially sensitive to in-service degradation of steels at high and low temperatures as well. A correlation between changes of electrochemical and mechanical properties in the steel degradation process is drawn up.

Słowa kluczowe

EN

steel; hydrogen degradation; corrosion; stress corrosion cracking; electrochemistry

• Wydawca: Politechnika Gdańska
• Czasopismo: Advances in Materials Science
• Rocznik: 2007
• Tom: Vol. 7, nr 1(11)
• Strony: 176--183
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Nykryforchyn H.

• Karpenko Physico-Mechanical Institute of the National Ukraine, Department of Corrosion-Hydrogen Degradation Lviv, Ukraine Academy of Science of and Materials Protection, Lviv, Ukraine

Bibliografia

• [1] Kurzydłowski K.J., Nykyforchyn H. Hydrogen degradation of structural materials in the energy and petrochemical industry. Maintenance Problems. 4 (2003), pp. 7-18 (in Polish).
• [2] Nykyforchyn H.M., Student O.Z. Assessment of high-temperature hydrogen degradation of power equipment steels / Proc. 16-th European Conf. of Fracture "Fracture of Nano and Engineering Materials and Structures". - Alexandroupolis: Springer, 2006. pp. 1011-1012.
• [3] Student O.Z. An accelerated method of hydrogen degradation of structural steels by thermocycling. Physico-Chemical Mechanics of Materials. 4 (1998). pp. 45-52.
• [4] Nykyforchyn H.M., Student O.Z., Dzioba I.R., Stepanyuk S.M., Markov A.D., Onyshchak Ya.D. Deagradation of welded joints of steam pipelines of thermal electric power plants in hydrogenated media. Materials Science. 6 (2004). pp. 836-843.
• [5] Babij L, Zagórski A., Student O. Effect of the 2,25Cr-Mo-V steel degradation in service conditions on its creep in hydrogen. Proc. "Problems of Corrosion and Corrosion Protection of Materials", Lviv, 2006. - Lviv: Karpenko Physico-Mechanical Institute NASU, 1 (2006). pp. 227-232.
• [6] Tsyrulnyk O.T., Nykyforchyn H.N., Zvirko O.I., Petryna Yu.D. Embrittlement of the steel of an oil-truk pipeline. Materials Science. 2 (2004). pp. 302-304.
• [7] Slobodyan, Z.V., Nykyforchyn H.M. and Petrushchak, O.I., Corrosion resistance of pipeline steel in oil-water environments. Materials Science. 38 (2002). pp. 424-429.
• [8] Slobodyan Z., Petrushchak O., Nykyforchyn H., Lunarska E. Peculiarities of corrosion fracture inner side surface of oil pipeline. Special issue Physico-Chemical Mechanics of Materials. 3 (2002). pp. 782-785.