On α′ precipitate composition in thermally annealed and neutron-irradiated Fe- 9-18Cr alloys
| Autor: | Peter B. Wells, Takuya Yamamoto, G. Robert Odette, Emmanuelle A. Marquis, Elaina R. Reese, Mukesh Bachhav |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Nuclear and High Energy Physics Phase boundary Materials science Annealing (metallurgy) Alloy Analytical chemistry 02 engineering and technology Atom probe engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences law.invention Nuclear Energy and Engineering law 0103 physical sciences engineering General Materials Science Neutron Irradiation 0210 nano-technology Embrittlement |
| Zdroj: | Journal of Nuclear Materials. 500:192-198 |
| ISSN: | 0022-3115 |
| Popis: | Ferritic-martensitic steels are leading candidates for many nuclear energy applications. However, formation of nanoscale α′ precipitates during thermal aging at temperatures above 450 °C, or during neutron irradiation at lower temperatures, makes these Fe-Cr steels susceptible to embrittlement. To complement the existing literature, a series of Fe-9 to 18 Cr alloys were neutron-irradiated at temperatures between 320 and 455 °C up to doses of 20 dpa. In addition, post-irradiation annealing treatments at 500 and 600 °C were performed on a neutron-irradiated Fe-18 Cr alloy to validate the α-α′ phase boundary. The microstructures were characterized using atom probe tomography and the results were analyzed in light of the existing literature. Under neutron irradiation and thermal annealing, the measured α′ concentrations ranged from ∼81 to 96 at.% Cr, as influenced by temperature, precipitate size, technique artifacts, and, possibly, cascade ballistic mixing. |
| Databáze: | OpenAIRE |
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