Research on hydrogen effects on phase distribution ahead of propagating cracks in stainless steel. Final report

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Description

This research was performed in support of computations to determine the distribution of hydrogen at a crack tip in an unstable stainless steel. It involved metallographic observations of the distribution of martensite at a stressed crack tip. It is concluded that the martensite phase distribution is much too fine to model realistically by the finite element method when far-field stress effects must be included. The mesh size would have to be less than 50 micrometers in order to include the effects of non-uniform distribution of martensite within a single grain. This would lead to unrealistic computation times. A reasonable compromise ... continued below

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7 p.

Creation Information

Altstetter, C. December 31, 1993.

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  • Altstetter, C. Univ. of Illinois, Urbana, IL (United States). Dept. of Materials Science and Engineering

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Description

This research was performed in support of computations to determine the distribution of hydrogen at a crack tip in an unstable stainless steel. It involved metallographic observations of the distribution of martensite at a stressed crack tip. It is concluded that the martensite phase distribution is much too fine to model realistically by the finite element method when far-field stress effects must be included. The mesh size would have to be less than 50 micrometers in order to include the effects of non-uniform distribution of martensite within a single grain. This would lead to unrealistic computation times. A reasonable compromise is to assume that a finite element will be considered to change from the hydrogen diffusivity of the austenite to that of the bcc martensitic phase when the yield stress of the austenite has been reached. This should give a significantly different hydrogen distribution from the case of untransforming austenite and allow the FEM computations to verify or disprove the kinetic model of hydrogen embrittlement of unstable austenitic stainless steels.

Physical Description

7 p.

Notes

OSTI as DE96000175

Source

  • Other Information: PBD: [1993]

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  • Other: DE96000175
  • Report No.: LA-SUB--93-155
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/106638 | External Link
  • Office of Scientific & Technical Information Report Number: 106638
  • Archival Resource Key: ark:/67531/metadc619802

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • December 31, 1993

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • July 28, 2016, 7:24 p.m.

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Altstetter, C. Research on hydrogen effects on phase distribution ahead of propagating cracks in stainless steel. Final report, report, December 31, 1993; New Mexico. (digital.library.unt.edu/ark:/67531/metadc619802/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.