The influence of irradiation-induced microstructure on the hardening of RPV steels

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Abstract

The hardening and embrittlement of RPV steels has been investigated for many years. Nowadays, a consensus is reached assuming a two-component hardening model of copper-enriched clusters and matrix damage. Nevertheless, despite being the subject of significant research efforts, it is still a debatable question, whether a linear or quadratic superposition law is appropriate. The inaccuracy of either choice might be the effect of the existence of different populations of defects, as every defect contributes to the hardening in a particular way. In this work, a correlation on model alloys is attempted between experimental results on microstructure and a theoretical prediction of the hardening, where each defect is defined by a specific pinning strength. It is found that loops are very strong defects, but due to their low concentration, they only play a minor role in the hardening itself. For the precipitates, the contrary is found, although they are quite soft (due to their very low sizes), they still play the dominant role in the hardening due to their high density. Vacancy clusters are important for the formation of the former two defects, but they will play almost no role in the hardening by themselves.

Details

Original languageEnglish
Title of host publication17th International Conference On Nuclear Engineering
Place of PublicationBelgium
Pages289-293
Publication statusPublished - Jul 2009
EventICONE 2009 - 17th International Conference on Nuclear Engineering - ASME, Brussels, Belgium
Duration: 12 Jul 200916 Jul 2009

Publication series

NameStudent Paper Competition
NumberVol 4

Conference

ConferenceICONE 2009 - 17th International Conference on Nuclear Engineering
CountryBelgium
CityBrussels
Period2009-07-122009-07-16

Keywords

  • Irradiation-induced hardening, Model alloys, RPV steel

ID: 137660