Degradation mode survey of titanium-base alloys

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Description

Of the materials reviewed, commercially pure titanium, Ti Gr 2, is the most susceptible to crevice corrosion. Ti Gr 7, 12, and 16 are likely to be resistant to crevice corrosion under the current expected Yucca Mountain repository conditions. Although Grade 7 has the greatest resistance to crevice corrosion it is also the most expensive. Although the possibility of sustained loads cracking exists, it has not yet been observed in a Ti alloys. For hydride precipitation to occur 100{degrees}C, the hydrogen concentration would need to be relatively high, much higher than the maximum amount of hydrogen allowed during the manufacture ... continued below

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62 p.

Creation Information

Gdowski, G.E. & Ahluwalia, H.S. January 30, 1995.

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  • Gdowski, G.E. Lawrence Livermore National Lab., CA (United States)
  • Ahluwalia, H.S. Science and Engineering Associates, Inc., Livermore, CA (United States)

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Description

Of the materials reviewed, commercially pure titanium, Ti Gr 2, is the most susceptible to crevice corrosion. Ti Gr 7, 12, and 16 are likely to be resistant to crevice corrosion under the current expected Yucca Mountain repository conditions. Although Grade 7 has the greatest resistance to crevice corrosion it is also the most expensive. Although the possibility of sustained loads cracking exists, it has not yet been observed in a Ti alloys. For hydride precipitation to occur 100{degrees}C, the hydrogen concentration would need to be relatively high, much higher than the maximum amount of hydrogen allowed during the manufacture of ({alpha} Ti alloys (0.0 15 wt%). A large amount of (SCC) stress corrosion cracking data accumulated at SNL and BNL for the WIPP program and by the Canadian Waste Management Program on titanium grades 2 and 12 indicates that there is no SCC at naturally occurring potentials in various brines. Hydride-induced cracking of titanium is a possibility and therefore, further investigation of this phenomenon under credible repository conditions is warranted. One disadvantage of titanium and its alloys is that their strengths decrease rather rapidly with temperature. This is due to the strong temperature dependence of interstitial solute strengthening mechanisms. Ti Gr 12 and 16 are recommended for further consideration as candidate materials for high level nuclear waste containers.

Physical Description

62 p.

Notes

INIS; OSTI as DE95017044

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  • Other Information: PBD: 30 Jan 1995

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  • Other: DE95017044
  • Report No.: UCRL-ID--121191
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/94656 | External Link
  • Office of Scientific & Technical Information Report Number: 94656
  • Archival Resource Key: ark:/67531/metadc792237

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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

  • January 30, 1995

Added to The UNT Digital Library

  • Dec. 19, 2015, 7:14 p.m.

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  • Feb. 18, 2016, 12:19 p.m.

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Gdowski, G.E. & Ahluwalia, H.S. Degradation mode survey of titanium-base alloys, report, January 30, 1995; California. (digital.library.unt.edu/ark:/67531/metadc792237/: accessed November 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.