Solute segregation and precipitation across damage rates in dual-ion–irradiated T91 steel

Taller, Stephen A.; Pauly, Valentin; Jiao, Zhijie; Hanbury, Rigel; Was, Gary S.

doi:10.1016/j.jnucmat.2022.153626

Solute segregation and precipitation across damage rates in dual-ion–irradiated T91 steel

Journal Article · Fri Feb 25 23:00:00 EST 2022 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2022.153626· OSTI ID:1854473

^[1]; ^[2]; Jiao, Zhijie ^[2]; ^[2]; Was, Gary S. ^[2]

Univ. of Michigan, Ann Arbor, MI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

We report that dual-ion irradiations using 5.0 MeV defocused Fe²⁺ ions and co-injected energy degraded 2.00 to 2.85 MeV He²⁺ ions were conducted on a Fe9CrMo ferritic-martensitic steel T91 to 17 dpa at a damage rate range of 5 × 10^-5dpa/s to 3 × 10^-3 dpa/s at 445°C, followed by characterization of the microstructure using conventional and scanning transmission electron microscopy. Radiation induced Ni/Si clusters and radiation induced segregation were quantified using energy dispersive X-ray spectroscopy at each condition and were compared with the same material irradiated in the BOR-60 reactor and in the as-received condition. No significant Cr segregation was found at lath boundaries after dual-ion irradiation, while Ni and Si enrichments both decreased with increasing damage rate leading to a sharp decrease in the density of Ni/Si clusters with damage rate. Increased point defect recombination at higher ion damage rates likely reduced the Ni/Si cluster density compared with BOR-60. Although the overall vacancy concentration and diffusion are enhanced by the irradiation damage rate, the lack of time for thermal diffusion and ballistic displacements of solutes are significant limiting factors for Ni/Si cluster formation. This work demonstrates the effect of irradiation damage rate on elemental segregation and clustering when using ion irradiation to simulate reactor irradiation.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP); University of Michigan College of Engineering

Grant/Contract Number:: AC05-00OR22725; NE0000639

OSTI ID:: 1854473

Alternate ID(s):: OSTI ID: 1847980

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: 1 Vol. 563; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Solute segregation and precipitation across damage rates in dual-ion–irradiated T91 steel

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