Eleventh International Conference on Internal Friction and Ultrasonic Attenuation in Solids
J. Phys. IV France 06 (1996) C8-59-C8-62
Effect of the Hydrogen Induced Degradation of Steel on the Internal Friction SpectraE. Lunarska1, Y. Ososkov1 and Y. Jagodzinski2
1 Institute of Physical Chemistry, Polish Academy of Sciences, 01-224 Warsaw, Ul.Kasprzaka 44/52, Poland
2 Institute of Metal Physics, National Academy of Sciences, Kiev, Ukraine
The internal friction method was applied to study the process of the formation of hydrogen induced voids in a pipe line steel. Hydrogen precharging to a content, lower than that established in permeation tests as the critical one for void formation, affected the IF spectrum associated with the grain boundary relaxation. This implies the possibility for application of the mechanical spectroscopy methods for detection of initial stages of the hydrogen induced degradation of steels. The effect of hydrogen precharging on the grain boundary structure and on relaxation processes are discussed.
© EDP Sciences 1996