Assessment of the lifetime of the beam window of MEGAPIE target liquid metal container

Investigation of LBE embrittlement effects on the fracture properties of T91

“…It can be concluded that the pre-requests for LME of FM steels are: wetting (intimate contact), surface cracks or flows, and a certain level of stress concentration at crack tips. Meanwhile, our preliminary investigations on irradiated T91 specimens demonstrated that the LBE embrittlement effect might increase with irradiation dose, or with irradiation induced hardening [10,11]. However, due to high costs of irradiation and difficulties in handling radioactive specimens, studies on the LME of irradiated materials are very limited up to now.…”

Liquid Pb–Bi embrittlement effects on the T91 steel after different heat treatments

“…the T91 steel) are selected for structural components in contact with LBE. In the MEGAPIE (the Mega-watt pilot experiment) target R&D program, this issue was greatly emphasized, because some preliminary results illustrated more severe LBE embrittlement effects on irradiation hardened specimens [8,9]. However, due to the difficulties of handling radioactive specimens, studies on the LME of irradiated materials are still very limited.…”

Tensile tests and TEM investigations on LiSoR-2 to -4

“…As demonstrated by bending tests on irradiated T91 samples in LBE, the reduction of fracture toughness attributed to LBE effects increases with irradiation dose [10]. However, from the results presented in Figs.…”

“…5 and 6, it is difficult to see a clear irradiation dose dependence of LBE embrittlement. This is mainly due to the fact that many higher dose samples are irradiated at high temperatures and do not show radiation hardening which is believed to promote the embrittlement of martensitic steels in LBE [10]. This fact is evident in sample T4-Z-08 which has the greatest radiation hardening and shows the most significant embrittlement case.…”