du.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Analysis of the plastic deformation behavior for two austenitic NiCr-steels with different stacking fault energies
Dalarna University, School of Technology and Business Studies, Materials Technology.
Sandvik Materials Technology.
Dalarna University, School of Technology and Business Studies, Materials Technology.ORCID iD: 0000-0002-4359-4967
2018 (English)In: International Journal of Computational Physics Series, ISSN 2631-8350, Vol. 1, no 1, p. 137-141Article in journal (Refereed) Published
Abstract [en]

Two austenitic stainless steels, with low and medium stacking fault energies (SFE), 20 mJ/m2 and 30 mJ/m2 respectively, have been studied by conventional tensile tests and in situ tensile tests in a FEG-SEM equipped for EBSD. High angle boundaries (HAB) and low angle boundaries (LAB) with misorientations >= 10o and >= 2o respectively have been determined, and size distributions for the LABs have been derived by linear intercepts. It was found that the size distributions could be described by bimodal lognormal functions. For the steel with highest SFE plastic deformation took place by dislocation slip only while the steel with low SFE deformed by slip and twinning. Using a model for slip based on the evolution of the dislocation density with the generation of dislocations inversely proportional to the mean free distance of slip and recovery of dislocations proportional to the dislocation density the stress strain-curves were analyzed and the results compared with the measured quantities. The mean free distance of slip as evaluated from the stress-strain curve for the steel with the highest SFE correlates very well with the mean size of the LABs intercept. The rate of recovery also gave an expected stress dependence. The stress needed to start deformation twinning was based on the assumption that Shockley partials become completely separated in the slip plane. The thus calculated values for the twinning stress showed an excellent agreement with the observed start of twinning as given by EBSD evaluation of twin boundaries (TB). For the alloy with low SFE both surface grains (in situ test) and bulk grains (from interrupted conventional tests) were studied. The stress needed for slip and twinning of surface grains was, as expected, in the order of 0.5-0.6 times the applied stress.

Place, publisher, year, edition, pages
NSSEL Publishing , 2018. Vol. 1, no 1, p. 137-141
Keywords [en]
Austenitic stainless steels, Electron backscatter diffraction (EBSD), In situ tension test, Grain boundaries, Flow stress model
National Category
Materials Engineering
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-30084DOI: 10.29167/A1I1P137-141OAI: oai:DiVA.org:du-30084DiVA, id: diva2:1317112
Conference
International Conference on Computational Materials Science and Thermodynamic Systems
Available from: 2019-05-21 Created: 2019-05-21 Last updated: 2019-05-22Bibliographically approved

Open Access in DiVA

fulltext(355 kB)39 downloads
File information
File name FULLTEXT01.pdfFile size 355 kBChecksum SHA-512
cb9e9b5b904928faae2eff4b7fcb6cee44c01eb380ceca9fc5ac7aabe47c44b3750741ed24876235bba41444d7c03e38dc499178fb9fa0d746ec7ab0806c4aca
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Authority records BETA

Engberg, GöranYvell, Karin

Search in DiVA

By author/editor
Engberg, GöranYvell, Karin
By organisation
Materials Technology
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 39 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 87 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • chicago-author-date
  • chicago-note-bibliography
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf