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

Published online by Cambridge University Press:  27 December 2016

S. Rogozhkin ,
A. Nikitin ,
N. Orlov ,
A. Bogachev ,
O. Korchuganova ,
A. Aleev ,
A. Zaluzhnyi ,
T. Kulevoy ,
R. Lindau  and
A. Möslang
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S. Rogozhkin*
Affiliation:
State Scientific Centre of the Russian Federation – Institute for Theoretical and Experimental Physics of National Research Centre “Kurchatov Institute”, 117218 Moscow, Russia National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
A. Nikitin
Affiliation:
State Scientific Centre of the Russian Federation – Institute for Theoretical and Experimental Physics of National Research Centre “Kurchatov Institute”, 117218 Moscow, Russia National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
N. Orlov
Affiliation:
State Scientific Centre of the Russian Federation – Institute for Theoretical and Experimental Physics of National Research Centre “Kurchatov Institute”, 117218 Moscow, Russia National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
A. Bogachev
Affiliation:
State Scientific Centre of the Russian Federation – Institute for Theoretical and Experimental Physics of National Research Centre “Kurchatov Institute”, 117218 Moscow, Russia National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
O. Korchuganova
Affiliation:
State Scientific Centre of the Russian Federation – Institute for Theoretical and Experimental Physics of National Research Centre “Kurchatov Institute”, 117218 Moscow, Russia National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
A. Aleev
Affiliation:
State Scientific Centre of the Russian Federation – Institute for Theoretical and Experimental Physics of National Research Centre “Kurchatov Institute”, 117218 Moscow, Russia National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
A. Zaluzhnyi
Affiliation:
State Scientific Centre of the Russian Federation – Institute for Theoretical and Experimental Physics of National Research Centre “Kurchatov Institute”, 117218 Moscow, Russia National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
T. Kulevoy
Affiliation:
State Scientific Centre of the Russian Federation – Institute for Theoretical and Experimental Physics of National Research Centre “Kurchatov Institute”, 117218 Moscow, Russia National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
R. Lindau
Affiliation:
Karlsruhe Institute of Technology, 76344 Karlsruhe, Germany
A. Möslang
Affiliation:
Karlsruhe Institute of Technology, 76344 Karlsruhe, Germany
P. Vladimirov
Affiliation:
Karlsruhe Institute of Technology, 76344 Karlsruhe, Germany
*
*(Email: [email protected])
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Abstract

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 (1024 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.

Keywords

steelembrittlementnanostructure
Type
Articles
Information
MRS Advances , Volume 2 , Issue 21-22: Energy and Sustainability , 2017 , pp. 1143 - 1155
Copyright
Copyright © Materials Research Society 2016 

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