Microstructure and mechanical properties of ferritic/martensitic steel EP-823 after neutron irradiation to high doses in BOR-60
Source abstract
Abstract
Short-term mechanical properties and microstructure of ferritic/martensitic steel EP-823 were investigated following irradiation as fuel pin cladding in BOR-60 to 63 dpa at 365-680?. Ring specimens cut from the cladding were used for ring-pull tests and electron microscopy. Up to {approx}460? irradiated EP-823 was found to fracture in a brittle mode at low strength levels. With increasing temperature the total elongation increased to 27.5 %. The irradiated strength in the temperature range 460-670? was found to be close to its unirradiated value. Void formation in EP-823 was suppressed with isolated voids observed only at 375? to 50.5 dpa. After irradiation at 375 and 500? finely dispersed ?6? precipitates formed. At 500 and 630? equiaxed -phase formed in ferritic grains and plate-like ?2? precipitates, which were present in the starting microstructure, dissolved completely.
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Research context
OpenAlex topics: Fusion materials and technologies · Nuclear Materials and Properties · Hydrogen embrittlement and corrosion behaviors in metals
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References (7)
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