Investigating radiation-induced segregation on intragranular defects in a 316L(N)

[摘要] Radiation induced segregation (RIS) on lattice defects and phase stability under irradiation have been investigated in an optimized solution annealed 316L(N) with an increased content of N and a significant amount of Nb. Primary Z-phase nitrides were observed within the as-received microstructure. 5 MeV Fe3+ ion irradiation was conducted at 450 degrees C up to 1dpa. Post-ion irradiation characterization was performed via nanoscale techniques coupling and correlation to associate radiation induced defects such as cavities and dislocation loops to the local chemistry. Cr, Fe and Ni observed RIS trends were expected, but P was solely measured at the vicinity of cavities. Void-precipitate association has been detected thanks to transmission electron microscopy (TEM) and it is believed to explain the low reduced atomic density measured at the location of a feature within an atom probe tomography (APT) volume. Nb-rich novel features were observed after irradiation and first results are brought to establish a link between these features and the primary Z-phase. (C) 2021 Elsevier B.V. All rights reserved.

[发布日期] 2021-12-15

[关键词] Radiation-induced segregation;Austenitic stainless steels;TEM-APT correlative microscopy;Ion irradiation;Z-phase