期刊
VACUUM
卷 219, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2023.112751
关键词
2.25Cr-1Mo-0.25V steel; Electrochemical hydrogen charging; Hydrogen embrittlement; Stress corrosion; Hydrogen diffusivity
This study proposed a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results showed that the hydrogen permeation curve obtained was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the specimens increased with increasing stress.
Hydrogen equipment for long-term service in complex hydrogen environment is threatened by the phenomenon of hydrogen-induced damage, and the combined effect of stress corrosion and hydrogen attack can intensify the formation and development of hydrogen damage. In this study, a new strategy to indirectly estimate the hydrogen diffusivity of metallic materials under tensile stress was proposed by combining the electrochemical hydrogen permeation test (EHPT), the hydrogen diffusion descriptive equation based on Fick's law, and hydrogen pre-charged tensile test. The results revealed that the hydrogen permeation curve obtained after considering the effect of the residual hydrogen extraction stage was highly approximate to the theoretical trend. The hydrogen embrittlement (HE) susceptibility of the pre-tensioned tensile and hydrogen-charged specimens increased with increasing stress. At tensile stress (0-400 MPa) the effective hydrogen diffusivity of 2.25Cr-1Mo0.25 V steel was: Deff = 1.1686+ 0.4842 x exp(sigma /277.869). The micrograph from the fracture surfaces also reflected the aggravated brittle fracture characteristics of the steel.
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