Temperature dependence of irradiation hardening due to dislocation loops and precipitates in RPV steels andd model alloys

Dmitry Terentyev, Sergiy Kotrechko, Vladimir Dubinko, Nataliya Stetsenko, Xinfu He, Mikhail V. Sorokin

    Research outputpeer-review


    A relative contribution to irradiation hardening caused by dislocation loops and solute-rich precipitates is established for RPV steels of WWER-440 and WWER-1000 reactors, based on TEM measurements and mechanical testing at reactor operating temperature of 563 K. The pinning strength factors evaluated for loops and precipitates are shown to be much lower than those obtained for model alloys based on the room temperature testing as well as those evaluated by means of atomistic simulations in the temperature range of 300–600 K. This discrepancy is explained in the framework of a model of thermally activated dislocation motion, which takes into account the difference in temperature and strain rate employed in atomistic simulations and in mechanical testing.
    Original languageEnglish
    Pages (from-to)6-15
    Number of pages10
    JournalJournal of Nuclear Materials
    StatePublished - 12 Apr 2015

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