Characterization of austenitic stainless steels with regard to environmentally assisted fatigue in simulated light water reactor conditions

Matthias Bruchhausen (Corresponding Author), Gintautas Dundulis, Alec McLennan, Sergio Arrieta, Tim Austin, Romá N. Cicero, Walter John Chitty, Luc Doremus, Miroslava Ernestova, Albertas Grybenas, Caitlin Huotilainen, Jonathan Mann, Kevin Mottershead, Radek Novotny, Francisco Javier Perosanz, Norman Platts, Jean Christophe Le Roux, Philippe Spätig, Claudia Torre Celeizábal, Marius TwiteMarc Vankeerberghen

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Abstract

A substantial amount of research effort has been applied to the field of environmentally assisted fatigue (EAF) due to the requirement to account for the EAF behaviour of metals for existing and new build nuclear power plants. We present the results of the European project INcreasing Safety in NPPs by Covering Gaps in Environmental Fatigue Assessment (INCEFA-PLUS), during which the sensitivities of strain range, environment, surface roughness, mean strain and hold times, as well as their interactions on the fatigue life of austenitic steels has been characterized. The project included a test campaign, during which more than 250 fatigue tests were performed. The tests did not reveal a significant effect of mean strain or hold time on fatigue life. An empirical model describing the fatigue life as a function of strain rate, environment and surface roughness is developed. There is evidence for statistically significant interaction effects between surface roughness and the environment, as well as between surface roughness and strain range. However, their impact on fatigue life is so small that they are not practically relevant and can in most cases be neglected. Reducing the environmental impact on fatigue life by modifying the temperature or strain rate leads to an increase of the fatigue life in agreement with predictions based on NUREG/CR-6909. A limited sub-programme on the sensitivity of hold times at elevated temperature at zero force conditions and at elevated temperature did not show the beneficial effect on fatigue life found in another study.

Original languageEnglish
Article number307
Pages (from-to)1-20
Number of pages20
JournalMetals
Volume11
Issue number2
DOIs
Publication statusPublished - Feb 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Austenitic stainless steel
  • Environmentally assisted fatigue (EAF)
  • Light water reactor (LWR)
  • Nuclear power plant (NPP)
  • Surface roughness

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