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

Research output: Contribution to journalArticle

Authors

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

Institutes & Expert groups

  • G.V. Kurdyumov Institute for Metal Physics of NAS of the Ukraine, Kiev
  • NSC - Kharkov Institute of Physics and Technology
  • CIAE - China Institute of Atomic Energy
  • NRCKI - National research Center Kurchatov Institute

Documents & links

DOI

Abstract

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.

Details

Original languageEnglish
Pages (from-to)6-15
Number of pages10
JournalJournal of Nuclear Materials
Volume464
DOIs
StatePublished - 12 Apr 2015

Keywords

  • dislocation loops, RPV steels, precipitates

ID: 5464237