Strain energy density-distance criterion for the initiation of stress corrosion cracking of alloy X-750

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A strain energy density-distance criterion was previously developed and used to correlate rising-load K{sub c} initiation data for notched and fatigue precracked specimens of hydrogen precharged Alloy X-750. This criterion, which was developed for hydrogen embrittlement (HE) cracking, is used here to correlate static-load stress corrosion cracking (SCC) initiation times obtained for smooth geometry, notched and fatigue precracked specimens. The onset of SCC crack growth is hypothesized to occur when a critical strain, which is due to environment-enhanced creep, is attained within the specimen interior. For notched and precracked specimens, initiation is shown by analysis to occur at a variable ... continued below

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17 p.

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Hall, M.M. Jr. & Symons, D.M. May 1, 1996.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 29 times . More information about this article can be viewed below.

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  • Bettis Atomic Power Laboratory
    Publisher Info: Bettis Atomic Power Lab., West Mifflin, PA (United States)
    Place of Publication: West Mifflin, Pennsylvania

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Description

A strain energy density-distance criterion was previously developed and used to correlate rising-load K{sub c} initiation data for notched and fatigue precracked specimens of hydrogen precharged Alloy X-750. This criterion, which was developed for hydrogen embrittlement (HE) cracking, is used here to correlate static-load stress corrosion cracking (SCC) initiation times obtained for smooth geometry, notched and fatigue precracked specimens. The onset of SCC crack growth is hypothesized to occur when a critical strain, which is due to environment-enhanced creep, is attained within the specimen interior. For notched and precracked specimens, initiation is shown by analysis to occur at a variable distance from notch and crack tips. The initiation site varies from very near the crack tip, for highly loaded sharp cracks, to a site that is one grain diameter from the notch, for lower loaded, blunt notches. The existence of hydrogen gradients, which are due to strain-induced hydrogen trapping in the strain fields of notch and crack tips, is argued to be controlling the site for initiation of cracking. By considering the sources of the hydrogen, these observations are shown to be consistent with those from the previous HE study, in which the characteristic distance for crack initiation was found to be one grain diameter from the notch tip, independent of notch radius, applied stress intensity factor and hydrogen level.

Physical Description

17 p.

Notes

OSTI as DE96009884

Source

  • International coordinating group on environmentally assisted cracking, Toronto (Canada); Orlando, FL (United States), 15-17 Apr 1996; 20-21 May 1996

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  • Other: DE96009884
  • Report No.: CONF-9604120--5
  • Report No.: CONF-960588--1
  • Grant Number: AC11-93PN38195
  • Office of Scientific & Technical Information Report Number: 226450
  • Archival Resource Key: ark:/67531/metadc670259

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  • May 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 4, 2015, 12:07 p.m.

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Hall, M.M. Jr. & Symons, D.M. Strain energy density-distance criterion for the initiation of stress corrosion cracking of alloy X-750, article, May 1, 1996; West Mifflin, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc670259/: accessed November 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.