Strain hardening during mechanical twinning and dislocation channeling in irradiated 316 stainless steels

T. S. Byun, N. Hashimoto

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

Localized deformation mechanisms and strain-hardening behaviors in irradiated 316 and 316LN stainless steels were investigated, and a theoretical model was proposed to explain the linear strain-hardening behavior during the localized deformation. After low temperature irradiation to significant doses, the deformation microstructure changed from dislocation tangles to channels or mechanical twins. It was also observed that irradiation hardening straightened gliding dislocations and increased the tendency for forming pileups. Regardless of these microstructural changes, the strain-hardening behavior was relatively insensitive to the irradiation. This dose-independent strain-hardening rate resulted in dose independence of the true stress parameters, such as the plastic instability stress and true fracture stress. In the proposed model, the long-range back stress was formulated as a function of the number of pileup dislocations per slip band and the number of slip bands in a grain. The calculation results confirmed the experimental observation that strain-hardening rate was insensitive to the change in deformation mechanism because the long-range back stress hardening became as high as the hardening by tangled dislocations.

Original languageEnglish
Title of host publicationEffects of Radiation on Materials
Subtitle of host publication23rd International Symposium
PublisherASTM International
Pages121-133
Number of pages13
ISBN (Print)9780803134218
DOIs
StatePublished - 2008
EventEffects of Radiation on Materials: 23rd International Symposium - San Jose, CA, United States
Duration: Jun 13 2006Jun 15 2006

Publication series

NameASTM Special Technical Publication
Volume1492 STP
ISSN (Print)0066-0558

Conference

ConferenceEffects of Radiation on Materials: 23rd International Symposium
Country/TerritoryUnited States
CitySan Jose, CA
Period06/13/0606/15/06

Keywords

  • Dislocation channels
  • Long-range back stress
  • Mechanical twins
  • Pileup dislocations
  • Radiation effect
  • Strain localization
  • Strain-hardening behavior

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