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Evolution of microstructure in advanced ferritic-martensitic steels under irradiation : the origin of low temperature radiation embrittlement

Rogozhkin, S.; Nikitin, A.; Orlov, N.; Bogachev, A.; Korchuganova, O.; Aleev, A.; Zaluzhnyi, A.; Kulevoy, T.; Lindau, R.; Möslang, A.; Vladimirov, P. ORCID iD icon


Advanced reduced activation ferritic/martensitic steels and oxide dispersion-strengthened steels exhibit significant radiation embrittlement under low temperature neutron irradiation. In this study we focused on atom probe tomography (APT) of Eurofer97 and ODS Eurofer steels irradiated with neutrons and heavy ions at low temperatures. Previous TEM studies revealed dislocation loops in the neutron-irradiated f\m steels. At the same time, our APT showed early stages of solid solution decomposition. High density (10$^{24}$ m$^{-3}$) of ∼3–5 nm clusters enriched in chromium, manganese, and silicon atoms were found in Eurofer 97 irradiated in BOR-60 reactor to 32 dpa at 332°C. In this steel irradiated with Fe ions up to the dose of 24 dpa, pair correlation functions calculated using APT data showed the presence of Cr-enriched pre-phases.
APT study of ODS Eurofer found a significant change in the nanocluster composition after neutron irradiation to 32 dpa at 330 °C and an increase in cluster number density. APT of ODS steels irradiated with Fe ions at low temperatures revealed similar changes in nanoclusters.
These results suggest that irradiation-induced nucleation and evolution of very small precipitates may be the origin of low temperature radiation embrittlement of f\m steels.

Volltext §
DOI: 10.5445/IR/1000064535
DOI: 10.1557/adv.2016.657
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 2059-8521
KITopen-ID: 1000064535
HGF-Programm 34.13.01 (POF III, LK 01) Material f.therm.,mechan.u.Umweltbelast.
Erschienen in MRS advances
Verlag Cambridge University Press (CUP)
Band 2
Heft 21-22
Seiten 1143-1155
Bemerkung zur Veröffentlichung MRS-Fall Meeting 2016, Boston, USA, 27th November - 2nd December 2016
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