Radiation-induced segregation and the relationship to physical properties in irradiated austenitic alloys.

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Radiation-induced changes in composition are studied because these changes can degrade failure of materials irradiated in nuclear reactors. In this work, the effect of alloy composition on radiation-induced segregation, hardening, and void swelling is presented. Five alloys, Fe-18Cr-8Ni, Fe-16Cr-13Ni, Fe-18Cr-40Ni, Fe-16Cr-13Ni+Mo, and Fe-16Cr-13Ni+Mo+P (all compositions in wt. %), were irradiated with 3.2 MeV protons at 400 C to a dose of 0.5 displacements per atom. The change in grain boundary composition was measured using field emission gun scanning transmission electron microscopy and the hardening was measured using Vickers indentation. Void swelling is calculated from the void size distribution measured using ... continued below

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12 pages

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Allen, T. R.; Cole, J. I.; Was, G. S. & Kenik, E. A. June 5, 2002.

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Radiation-induced changes in composition are studied because these changes can degrade failure of materials irradiated in nuclear reactors. In this work, the effect of alloy composition on radiation-induced segregation, hardening, and void swelling is presented. Five alloys, Fe-18Cr-8Ni, Fe-16Cr-13Ni, Fe-18Cr-40Ni, Fe-16Cr-13Ni+Mo, and Fe-16Cr-13Ni+Mo+P (all compositions in wt. %), were irradiated with 3.2 MeV protons at 400 C to a dose of 0.5 displacements per atom. The change in grain boundary composition was measured using field emission gun scanning transmission electron microscopy and the hardening was measured using Vickers indentation. Void swelling is calculated from the void size distribution measured using transmission electron microscopy. After irradiation, Cr depletes and Ni enriches at grain boundaries. Increasing bulk Ni concentration causes greater Cr depletion and Ni enrichment at grain boundaries. For alloys with 16 Cr, the addition of P reduces the Cr depletion and Ni enrichment. Hardening does not directly correlate with composition, but a framework for isolating the effect of hardening and segregation on cracking is suggested. The amount of void swelling in the irradiated material is shown to correspond inversely with segregation. Those alloys with greater segregation tend to swell less.

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12 pages

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  • National Society of Black Physicists Conference, Huntsville, AL (US), 03/13/2002--03/16/2002

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  • Report No.: ANL/NT/CP-107888
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 797888
  • Archival Resource Key: ark:/67531/metadc733545

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Office of Scientific & Technical Information Technical Reports

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  • June 5, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 25, 2016, 2:30 p.m.

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Allen, T. R.; Cole, J. I.; Was, G. S. & Kenik, E. A. Radiation-induced segregation and the relationship to physical properties in irradiated austenitic alloys., article, June 5, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc733545/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.