Effects of helium on irradiation response of reduced-activation ferritic-martensitic steels: Using nickel isotopes to simulate fusion neutron response

Kim, B. K.; Tan, L.; Sakasegawa, H.; Parish, C. M.; Zhong, W.; Tanigawa, H.; Katoh, Y.

doi:10.1016/j.jnucmat.2020.152634

Effects of helium on irradiation response of reduced-activation ferritic-martensitic steels: Using nickel isotopes to simulate fusion neutron response

Journal Article · Sun Feb 28 23:00:00 EST 2021 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2020.152634· OSTI ID:1760135

^[1]; ^[1]; ^[2]; Parish, C. M. ^[1]; Zhong, W. ^[1]; Tanigawa, H. ^[3]; Katoh, Y. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Japan Atomic Energy Agency, Okayama (Japan)
National Institutes for Quantum and Radiological Science and Technology (Japan)

Understanding the effects of helium on microstructures and mechanical properties of reduced-activation ferritic-martensitic steels is important to use of these steels in fusion reactor structures. The 9Cr-2WVTa steels were doped with 58Ni and 60Ni isotopes at 2 weight percent to control the rate of transmutation helium generation. The samples were irradiated in the High Flux Isotope Reactor to ~24 displacements per atom at nominal temperatures of 300, 400, and 500°C, producing 228 and 7 atomic parts-per-million helium in the ⁵⁸Ni- and ⁶⁰Ni-doped samples, respectively. Transmission electron microscopy revealed a variety of precipitates and the radiation-induced dislocation loops and cavities (voids or helium bubbles). Tensile tests of the irradiated samples at the irradiation temperatures showed radiation-induced hardening at 300°C and radiation-induced softening at 400°C. Analysis indicates that the hardening primarily originated from the loops and cavities. The ⁵⁸Ni-doped samples had greater strengthening contributions from loops and cavities, leading to higher hardening with lower ductility than the ⁶⁰Ni-doped samples. The greater helium production of ⁵⁸Ni did not show pronounced reductions in ductility of the samples.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1760135

Alternate ID(s):: OSTI ID: 1776039

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: n/a Vol. 545; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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