Anelasticity in austenitic stainless steel

P. Ashwin Rao, John Bouchard, Shirley M. Northover, Michael E. Fitzpatrick

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Time-dependent anelastic deformation mechanisms arise in austenitic stainless steel when load is removed during a high-temperature creep test. This phenomenon is investigated by conducting creep tests, with intermittent load removal, on AISI Type 316H austenitic stainless steel at 550 and 650 °C, supported by in situ measurement of creep-induced intergranular residual strains by neutron diffraction. All the cyclic tests exhibit anelastic behaviour on unloading and develop substantially lower load-on creep strain rates, reduced ductility and longer rupture times than baseline steady-load creep tests at similar conditions. The mechanisms underlying the observed anelastic behaviour and changes in macroscopic creep properties are discussed with reference to the development of intergranular strains and dislocation behaviour.
Original languageEnglish
Pages (from-to)6851–6861
JournalActa Materialia
Volume60
Issue number19
DOIs
Publication statusPublished - Nov 2012

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Keywords

  • Creep test
  • Neutron diffraction
  • Transmission electron microscopy (TEM)
  • Austenitic steels

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