journal article·2025-10Open access

Irradiation stability of M23C6 in representative reduced activation ferritic martensitic steels

Lijuan Cui, Xunxiang Hu, Manuel Pouchon, Yufeng Du, Yong Dai

Abstract

The irradiation stability of M 23 C 6 precipitates in three reduced activation ferritic/martensitic steels (RAFMs) was investigated following irradiation of high-energy protons and neutrons at doses up to 21 dpa and temperatures up to 520°C in the targets of the Swiss Spallation Neutron Source. M 23 C 6 precipitates in specimens before and after irradiation were characterized using atom probe tomography. The concentrations of Mn, Si, P and N increased significantly in M 23 C 6 precipitates, while the W concentration in M 23 C 6 precipitates decreased with increasing irradiation temperature. The spallation transmutation elements Ti, Sc, Ca and K were enriched in the M 23 C 6 precipitates of irradiated specimens, The enriched elements also showed strong segregation at the M 23 C 6 -matrix interface. Cr-rich clusters and small α’ precipitates were observed near the M 23 C 6 precipitates in F82H and Eurofer 97 specimens irradiated at about 20 dpa and 300°C. At higher irradiation temperatures (480°C and 520°C), Fe-rich clusters were formed inside M 23 C 6 precipitates.
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OpenAlex topics: Fusion materials and technologies · Nuclear Materials and Properties · Hydrogen embrittlement and corrosion behaviors in metals

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