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

publication date

  • January 2021

start page

  • 1

end page

  • 9

volume

  • 543

International Standard Serial Number (ISSN)

  • 0022-3115

Electronic International Standard Serial Number (EISSN)

  • 1873-4820

abstract

  • Atom probe tomography has characterised the microstructural changes in T91 steel after BOR60 reactor irradiation at five temperatures between 376 degrees C and 524 degrees 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 degrees C and 415 degrees C, which is not observed at higher temperatures 460 degrees C and 524 degrees C. 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 degrees C.

subjects

  • Physics

keywords

  • atom probe tomography; bor60 reactor; mns-rich clusters; t91 steel