Crack initiation in tapered high Si stainless steel specimens – stress threshold analyses

Research output: Contribution to journalArticle

Authors

Institutes & Expert groups

  • SCK•CEN - Studiecentrum voor Kernenergie/Centre d’Etude de l’Energie Nucléaire
  • UA - Universiteit Antwerpen

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Abstract

Tapered specimens were used for an accelerated test technique to study the crack initiation of high Si stainless steel by means of constant elongation rate tensile testing in a simulated pressurised water reactor environment. Detailed crack density distributions were obtained by applying an advanced crack detection algorithm on iteratively displaced scanning electron microscopy pictures featuring stress corrosion cracks along the specimen’s gauge length. By means of finite-element analysis, prominent peaks in the crack density graphs are demonstrated to be related to stress relief and stress build-up during the crack initiation phase. Intrinsic scatter related to the crack detection suggests that stress corrosion cracking is independent of the strain-rate for strain-rates lower than 10−6 s−1. Based on the extrapolation to constant load conditions, the critical threshold value for the duplex high Si stainless steel is estimated to be around 580 MPa.

Details

Original languageEnglish
Pages (from-to)721-728
Number of pages8
JournalCorrosion Engineering, Science and Technology
Volume55
Issue number8
DOIs
Publication statusPublished - Jun 2020

Keywords

  • Stress corrosion cracking, Tapered specimens, Stress threshold, Crack initiation, Finite element analysis

ID: 7092545