The influence of composition on environmental embrittlement of iron aluminides

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Description

The effects of water vapor in air and hydrogen gas on the tensile and fatigue crack growth behavior of Fe{sub 3}Al alloys have been studied at room temperature. Fe-28a% Al-5a% Cr alloys to which either Zr alone or Zr and C have been added and tested in controlled humidity air environments as well as in 1.3 atm hydrogen or oxygen gas and in vacuum. As with other Fe{sub 3}Al alloys, oxygen produces the lowest crack growth rates as well as the highest critical stress intensities and tensile ductility in each of the alloys tested. However, while Zr lowers crack growth ... continued below

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38 p.

Creation Information

Alven, D.A. & Stoloff, N.S. July 1, 1996.

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  • Alven, D.A.
  • Stoloff, N.S. Rensselaer Polytechnic Inst., Troy, NY (United States). Materials Science and Engineering Dept.

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Description

The effects of water vapor in air and hydrogen gas on the tensile and fatigue crack growth behavior of Fe{sub 3}Al alloys have been studied at room temperature. Fe-28a% Al-5a% Cr alloys to which either Zr alone or Zr and C have been added and tested in controlled humidity air environments as well as in 1.3 atm hydrogen or oxygen gas and in vacuum. As with other Fe{sub 3}Al alloys, oxygen produces the lowest crack growth rates as well as the highest critical stress intensities and tensile ductility in each of the alloys tested. However, while Zr lowers crack growth rates in the Paris regime, there is no apparent beneficial effect on crack growth thresholds. Hydrogen gas also produces unusual results. While crack growth rates are very high in hydrogen in the Paris regime for all alloys, hydrogen only lowers the crack growth threshold relative to air in ternary Fe-28Al-5Cr; it does not lower the threshold in the Zr-containing alloys. It was found that decreased test frequency leads to increased crack growth rates in a Zr-containing alloy which points to a moisture-induced embrittlement mechanism responsible for the higher crack growth rates in air. Fracture path tends to be insensitive to environment for each alloy.

Physical Description

38 p.

Notes

OSTI as DE98054729

Source

  • Other Information: PBD: 1 Jul 1996

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  • Other: DE98054729
  • Report No.: ORNL/SUB--90-SF521/04
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/666023 | External Link
  • Office of Scientific & Technical Information Report Number: 666023
  • Archival Resource Key: ark:/67531/metadc710480

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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

  • July 1, 1996

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • June 23, 2016, 5:47 p.m.

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Alven, D.A. & Stoloff, N.S. The influence of composition on environmental embrittlement of iron aluminides, report, July 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc710480/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.