Grain boundary cavity growth under applied stress and internal pressure

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The growth of grain boundary cavities under applied stress and internal gas pressure was investigated. Methane gas filled cavities were produced by the C + 4H reversible CH4 reaction in the grain boundaries of type 270 nickel by hydrogen charging in an autoclave at 500/sup 0/C with a hydrogen pressure of either 3.4 or 14.5 MPa. Intergranular fracture of nickel was achieved at a charging temperature of 300/sup 0/C and 10.3 MPa hydrogen pressure. Cavities on the grain boundaries were observed in the scanning electron microscope after fracture. Photomicrographs of the cavities were produced in stereo pairs which were analyzed ... continued below

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Pages: 80

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Mancuso, J.F. August 1, 1977.

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Description

The growth of grain boundary cavities under applied stress and internal gas pressure was investigated. Methane gas filled cavities were produced by the C + 4H reversible CH4 reaction in the grain boundaries of type 270 nickel by hydrogen charging in an autoclave at 500/sup 0/C with a hydrogen pressure of either 3.4 or 14.5 MPa. Intergranular fracture of nickel was achieved at a charging temperature of 300/sup 0/C and 10.3 MPa hydrogen pressure. Cavities on the grain boundaries were observed in the scanning electron microscope after fracture. Photomicrographs of the cavities were produced in stereo pairs which were analyzed so as to correct for perspective distortion and also to determine the orientational dependence of cavity growth under an applied tensile stress.

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Pages: 80

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Dep. NTIS, PC A05/MF A01.

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  • Other Information: Thesis

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  • Report No.: COO-2172-18
  • Grant Number: EY-76-S-02-2172
  • DOI: 10.2172/5348813 | External Link
  • Office of Scientific & Technical Information Report Number: 5348813
  • Archival Resource Key: ark:/67531/metadc1064793

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • August 1, 1977

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 30, 2018, 12:25 p.m.

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Mancuso, J.F. Grain boundary cavity growth under applied stress and internal pressure, report, August 1, 1977; United States. (digital.library.unt.edu/ark:/67531/metadc1064793/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.