Study of the influence of hydrogenation kinetics on sulphide stress corrosion cracking of shipbuilding steels

Keywords

shipbuilding steels, degradation, hydrogenation, microhardness, crack growth resistance.

Cite as

Makarenko V. D., Chyhyrynets O. E., Vynnykov Yu. L., Gots V. I., Maksimov S. Yu., Pipa V. V., and Makarenko Yu. V. Study of the influence of hydrogenation kinetics on sulphide stress corrosion cracking of shipbuilding steels. Physicochemical Mechanics of Materials. 2024. 60(2), 057-062.

https://doi.org/10.15407/pcmm2024.02.057

Abstract

The kinetics of hydrogenation and the mechanisms of sulphide corrosion cracking of long-term operated pipe shipbuilding 15KhСND and D32 steels were evaluated. It is found that with the increase of the service life these steels are intensively hydrogenated from the inner sur­face of the pipe, the concentration of hydrogen exceeds the initial values in 2–2.5 times. The same tendency of microhardness changes in the cross-section of the metal wall of pipes with different service life is observed. Its values in the near-surface layers from the outer side of the pipe increase in 1.5–2 times. With the increase of the stresses during tests under corrosion sulphide cracking in the NACE environment hydrogenation of the samples increases dramatically (in approxi­mately 2–3 times), which causes severe em­brittlement (increasing the microhardness of the metal) and a decrease in the crack growth resistance.

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