Effects of neutron irradiation on deformation behavior of nickel-base fastener alloys

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This paper presents the effects of neutron irradiation on the fracture behavior and deformation microstructure of high-strength nickel-base alloy fastener materials, Alloy X-750 and Alloy 625. Alloy X-750 in the HTH condition, and Alloy 625 in the direct aged condition were irradiated to a fluence of 2.4x10{sup 20} n/cm{sup 2} at 264 C in the Advanced Test Reactor. Deformation structures at low strains were examined. It was previously shown that Alloy X-750 undergoes hardening, a significant degradation in ductility and an increase in intergranular fracture. In contrast, Alloy 625 had shown softening with a concomitant increase in ductility and transgranular ... continued below

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10 p.

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Bajaj, R.; Mills, W.J.; Kammenzind, B.F. & Burke, M.G. July 1, 1999.

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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

This paper presents the effects of neutron irradiation on the fracture behavior and deformation microstructure of high-strength nickel-base alloy fastener materials, Alloy X-750 and Alloy 625. Alloy X-750 in the HTH condition, and Alloy 625 in the direct aged condition were irradiated to a fluence of 2.4x10{sup 20} n/cm{sup 2} at 264 C in the Advanced Test Reactor. Deformation structures at low strains were examined. It was previously shown that Alloy X-750 undergoes hardening, a significant degradation in ductility and an increase in intergranular fracture. In contrast, Alloy 625 had shown softening with a concomitant increase in ductility and transgranular failure after irradiation. The deformation microstructures of the two alloys were also different. Alloy X-750 deformed by a planar slip mechanism with fine microcracks forming at the intersections of slip bands with grain boundaries. Alloy 625 showed much more homogeneous deformation with fine, closely spaced slip bands and an absence of microcracks. The mechanism(s) of irradiation assisted stress corrosion cracking (IASCC) are discussed.

Physical Description

10 p.

Notes

INIS; OSTI as DE00755393

Medium: P; Size: 10 pages

Source

  • 9th International Conference on Environmental Degradation of Nuclear Power Systems - Water Reactor, Newport Beach, CA (US), 08/01/1999--08/05/1999

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  • Report No.: B-T-3242
  • Grant Number: AC11-98PN38206
  • Office of Scientific & Technical Information Report Number: 755393
  • Archival Resource Key: ark:/67531/metadc711706

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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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  • July 1, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2017, 6:46 p.m.

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Bajaj, R.; Mills, W.J.; Kammenzind, B.F. & Burke, M.G. Effects of neutron irradiation on deformation behavior of nickel-base fastener alloys, article, July 1, 1999; West Mifflin, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc711706/: accessed April 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.