Some effects of surface finish and LWR environment on environmentally-assisted crack initiation in Alloy 182

Research output: Contribution to report/book/conference proceedingsIn-proceedings paperpeer-review

Authors

  • Marc Vankeerberghen
  • Rik-Wouter Bosch
  • Alice Dinu
  • Michael Grimm
  • Anna Hojna
  • Jill Meadows
  • Radek Novotny
  • Francisco-Javier Perosanz
  • Zaiqing Que
  • Stefan Ritter
  • Fabio Scenini
  • Aki Toivonen
  • Liberato Volpe
  • Bojan Zajec

Institutes & Expert groups

  • Technologies for Nuclear Energy State Owned Company
  • JRC - Joint Research Centre
  • Framatome
  • CVR - Centrum Vyzkumu Rez
  • Jacobs
  • CIEMAT - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
  • VTT - Technical Research Centre of Finland Ltd.
  • PSI - Paul Scherrer Institute
  • UNIMAN - The University of Manchester
  • ZAG - Slovenian National Building and Civil Engineering Institute

Documents & links

Abstract

Under certain conditions, weld alloy 182 has been shown to be prone to environmentally-assisted cracking in light water reactor primary water. Within the European, collaborative project MEACTOS, environmentally-assisted crack initiation was addressed by performing constant elongation rate testing of flat, tapered tensile specimens for four surface finishes (a polished one that serves as a reference, an industrial-milled one, an advanced-machined one and a shot peened one), under both a BWR/NWC (boiling water reactor under normal water chemistry) and a PWR (pressurized water reactor) primary water environment, at various cross-head displacement rates. After testing the critical stress for initiating an environmentally-assisted crack was derived by locating the critical section (the border between areas showing and not showing surface cracking after testing) and calculating the associated local stress. In a first analysis the critical stress was plotted against the nominal strain rate (cross-head displacement rate divided by the length of the tapered gauge section) and an exponential curve was fitted to it; yielding a characteristic critical stress (extrapolation to zero nominal strain rate) and a characteristic nominal strain rate (rendering the nominal strain rate dimensionless under the exponent). In a second analysis an initiation model was fitted to obtain a usage towards EAC initiation of 1 in the experimentally-determined critical cross section. The model is strain rate and stress level dependent. The data and the results of both analyses will be presented and discussed in terms of environmentally-assisted crack initiation.

Details

Original languageEnglish
Title of host publicationProceedings of the 20th Iiternational conference on environmental degradation of materials in nuclear power systems-water reactor
PublisherAMPP - Association for Materials Protection and Performance
Pages1-23
Number of pages23
Publication statusAccepted/In press - 17 Jul 2022
Event2022 - 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor - The Viewline Resort, Snowmass, United States
Duration: 17 Jul 202221 Jul 2022
https://envdeg.nace.org/

Conference

Conference2022 - 20th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactor
Country/TerritoryUnited States
CitySnowmass
Period2022-07-172022-07-21
Internet address

Keywords

  • EAC, Initiation, Alloy 182, LWR, Surface finish

ID: 7954976