PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY
Series: Nuclear and Reactor Constants

since 1971

Русский (РФ)

ISSN 2414-1038 (online)

CALCULATION OF STRESSES IN A SAMPLE DURING ION IRRADIATION OF STRUCTURAL MATERIALS

EDN: BNGBWM

Authors & Affiliations

Gusev N.V., Pechenkin V.A., Folomeev V.I.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia

Gusev N.V. – Researcher.
Pechenkin V.A. – Leading Researcher, Cand. Sci. (Phys.-Math.). Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: +7 (484) 399-80-19; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Folomeev V.I. – Leading Researcher.

Abstract

Stresses arising both during reactor and accelerator irradiation can have a significant impact on radiation phenomena in structural reactor materials (SM). The work proposes a methodology and carries out calculations of stresses caused by temperature gradients and implanted ions accumulation in samples made of austenitic (for example ChS68) and ferritic-martensitic (for example EP823) steels for typical conditions of irradiation with nickel and iron ions in the target device of Tandem-3M accelerator. For calculations by the finite element method (FEM) of temperature and stress fields, the
SIMULIA Abaqus code was used.
Calculations of temperature distribution in the target device and in samples made of EP823 and ChS68 steels under irradiation with Fe3+ and Ni3+ ions, respectively, with an energy of 11.5 MeV were carried out. The stresses caused by temperature gradients in the samples of both steels are small and do not exceed several MPa in the irradiation region. For the same irradiation conditions, FEM calculations of strains and stresses caused by ion implantation were carried out in samples of these steels at various damage doses up to 250 dpa. An analytical expression is obtained for the steady-state profile of stress intensity along the depth of the sample, determined by the ratio of ion implantation and radiation creep rates, which is in good agreement with the steady-state values calculated by FEM. Analytical estimates of possible local stresses associated with vacancy swelling of steels are obtained. These stresses are comparable with ones arising in the SM of fuel pin claddings at high doses of reactor irradiation.
For both steels considered, the stresses associated with ion implantation can be large, but they are localized in the zone of implanted ions accumulation. By choosing a relatively high ion energy
(5–12 MeV) for irradiation, it is possible to provide a sufficiently wide area for studying the microstructure of irradiated SM samples, remote both from the sample surface and from the region of high stresses in the implanted ions accumulation zone.

Keywords
accelerator irradiation, ion implantation, structural materials, EP823 and ChS68 steels, temperature gradients, strains, deformations

Article Text (PDF, in Russian)

References

UDC 621.039

Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2024, no. 2, 2:12