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Fracture behaviour of the 14Cr ODS steel exposed to helium and liquid lead

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    0480409 - ÚFM 2018 RIV NL eng J - Článek v odborném periodiku
    Hojná, A. - Di Gabriele, F. - Hadraba, Hynek - Husák, Roman - Kuběna, Ivo - Rozumová, L. - Bublíková, P. - Kalivodová, J. - Matějíček, Jiří
    Fracture behaviour of the 14Cr ODS steel exposed to helium and liquid lead.
    Journal of Nuclear Materials. Roč. 490, JUL (2017), s. 143-154. ISSN 0022-3115. E-ISSN 1873-4820
    Grant CEP: GA ČR(CZ) GA14-25246S; GA ČR(CZ) GA14-12837S; GA MŠk(CZ) LQ1601
    Institucionální podpora: RVO:68081723 ; RVO:61389021
    Klíčová slova: Impact fracture * Microanalysis * Nanostructured steel * Oxidation * Thermal ageing
    Kód oboru RIV: JG - Hutnictví, kovové materiály; JG - Hutnictví, kovové materiály (UFP-V)
    Obor OECD: Materials engineering; Materials engineering (UFP-V); Materials engineering (UFM-A)
    Impakt faktor: 2.447, rok: 2017

    This work describes the fracture behaviour of the 14Cr ODS steel produced by mechanical alloying process, after high temperature exposures. Small specimens were exposed to helium gas in a furnace at 720 degrees C for 500 h. Another set of specimens was exposed to flowing liquid lead in the COLONRI II loop at 650 degrees C for 1000 h. All specimens were tested for the impact and tensile behaviour. The impact test results are compared to other sets of specimens in the as received state and after isothermal annealing at 650 degrees C for 1000 h. The impact curves of the exposed materials showed positive shifts on the transition temperature. While the upper shelf value did not change in the Pb exposed ODS steel, it significantly increased in the He exposed one. The differences are discussed in terms of surface and subsurface microscopy observation. The embrittlement can be explained as the effect of a slight change in the grain boundary and size distribution combined with the depletion of sub-surface region from alloying elements forming oxide scale on the surface.
    Trvalý link: http://hdl.handle.net/11104/0276865
Počet záznamů: 1