HYDROGEN ENHANCED SLOW CRACK GROWTH IN 4340 STEEL.

Karl Sieradzki, P. J. Ficalora

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Scopus citations

Abstract

Subcritical crack growth in a quenched and tempered 4340 steel was studied as a function of hydrogen pressure, (P//H(2)), at 298 K. Under sustained load the threshold stress intensity for crack propagation was dependent on the hydrogen pressure in the pressure range tested, (20 torr less than equivalent to P//H(2) less than equivalent to 760 torr). Crack growth rates as a function of stress intensity, (K), exhibited a K-dependent region (stage I) and a K-independent region (stage II). In stage I the crack growth rate is proportional to P**n//H(2) where n greater than 1, and in stage II the crack growth rate is proportional to the first power of the pressure of the hydrogen gas, (n equals 1). The results are explained in terms of rate determining processes and a model explaining the kinetics of hydrogen enhanced slow crack growth is developed.

Original languageEnglish (US)
Title of host publicationUnknown Host Publication Title
Place of PublicationBlacksburg, Va
PublisherLab for the Study of Environ Degradation of Eng Mater
Pages523-532
Number of pages10
StatePublished - 1977
Externally publishedYes
EventEnviron Degradation of Eng Mater, Proc of Conf - Blackburg, VA, USA
Duration: Oct 10 1977Oct 12 1977

Other

OtherEnviron Degradation of Eng Mater, Proc of Conf
CityBlackburg, VA, USA
Period10/10/7710/12/77

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Sieradzki, K., & Ficalora, P. J. (1977). HYDROGEN ENHANCED SLOW CRACK GROWTH IN 4340 STEEL. In Unknown Host Publication Title (pp. 523-532). Lab for the Study of Environ Degradation of Eng Mater.