期刊
ACTA MATERIALIA
卷 74, 期 -, 页码 285-295出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.04.034
关键词
Ferritic/martensitic steel; Heavy ion irradiation; Grain size effect; Equal channel angular extrusion or pressing (ECAE or ECAP); Swelling
资金
- DOE-NEUP [DE-AC07-05ID14517-00088120]
- NSF-DMR-Metallic Materials and Nanostructures Program [1304101]
- NSF [0846835]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1643915] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1304101] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0846835] Funding Source: National Science Foundation
The life extension of current pressurized water reactors and the design of reliable next-generation nuclear reactors call for advanced structural steels that can sustain radiation up to several hundred displacements per atom (dpa) at elevated temperatures. Here we performed Fe ion irradiation to 150 dpa at 450 degrees C on bulk coarse-grained (CG, with a grain size of similar to 2 mu m) and ultrafine-grained (UFG, with grain size of similar to 320 nm) T91 steels. Extensive microscopy studies show that fine grains in UFG T91 reduced the density of nanocavities and dislocation loops. The swelling rate in UFG steel is three times lower than that of CG T91 due to the existence of abundant defect sinks, such as high angle grain boundaries and dislocations. A strong surface effect with size dependence was noted during heavy ion irradiation studies. The large deviation of swelling rate from neutron irradiated specimens implies the significance of He concentration and presumably dose rate on swelling in nuclear reactors. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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