Characterisation of nano-scale precipitates in BOR60 irradiated T91 steel using atom probe tomography

Yeli, Guma; Strutt, Victoria C. I.; Auger, M. A.; Bagot, Paul A. J.; Moody, Michael P.

doi:10.1016/j.jnucmat.2020.152466

Title: Characterisation of nano-scale precipitates in BOR60 irradiated T91 steel using atom probe tomography

Journal Article · Sun Aug 30 00:00:00 EDT 2020 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2020.152466· OSTI ID:1850446

Yeli, Guma ^[1];

^[2];

^[3]; Bagot, Paul A. J. ^[2]; Moody, Michael P. ^[2]

Univ. of Oxford (United Kingdom). Dept. of Materials; City Univ. of Hong Kong, Kowloon (Hong Kong). Centre for Advanced Nuclear Safety and Sustainable Development
Univ. of Oxford (United Kingdom). Dept. of Materials
Univ. of Oxford (United Kingdom). Dept. of Materials; Universidad Carlos III de Madrid, Leganés, Madrid (Spain). Dept. of Physics

Atom probe tomography has characterised the microstructural changes in T91 steel after BOR60 reactor irradiation at five temperatures between 376 °C and 524 °C to doses between 14.6 dpa and 35.1 dpa. Irradiation-induced precipitation and segregation to carbide/matrix interface induced by neutron irradiation has been characterised. Atom probe tomography characterisation shows that Mn, Ni, Si -rich (MNS-rich) clusters form in T91 steel irradiated in BOR60 reactor at temperatures between 376 °C and 415 °C, which is not observed at higher temperatures 460 °C and 524 °C. Additionally, the number density, volume fraction and composition of MNS-rich clusters have been characterised. Ni, Mn, Si and P is found to segregate at carbide matrix interface after irradiation at lower temperature and only P segregation is observed at 524 °C.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); Engineering and Physical Sciences Research Council (EPSRC)

Grant/Contract Number:: NE0000639; EP/L025817/1; EP/M022803/1

OSTI ID:: 1850446

Alternate ID(s):: OSTI ID: 1660302

Journal Information:: Journal of Nuclear Materials, Vol. 543, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
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Title: Characterisation of nano-scale precipitates in BOR60 irradiated T91 steel using atom probe tomography

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