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Experimental study of the gamma-surface of austenitic stainless steels
Dalarna University, School of Technology and Business Studies, Materials Technology. KTH.ORCID iD: 0000-0002-7355-1941
Dalarna University, School of Technology and Business Studies, Materials Technology.
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2019 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 173, p. 34-43Article in journal (Refereed) Published
Abstract [en]

We introduce a theory-guided experimental approach to study the γ-surface of austenitic stainless steels. The γ-surface includes a series of intrinsic energy barriers (IEBs), which are connected to the unstable stacking fault (USF), the intrinsic stacking fault (ISF), the unstable twinning fault (UTF) and the extrinsic stacking fault (ESF) energies. The approach uses the relationship between the Schmid factors and the effective energy barriers for twinning and slip. The deformation modes are identified as a function of grain orientation using in situ electron backscatter diffraction measurements. The observed critical grain orientation separating the twinning and slip regimes yields the USF energy, which combined with the universal scaling law provides access to all IEBs. The measured IEBs and the critical twinning stress are verified by direct first-principles calculations. The present advance opens new opportunities for modelling the plastic deformation mechanisms in multi-component alloys.

Place, publisher, year, edition, pages
2019. Vol. 173, p. 34-43
Keywords [en]
stacking fault energy, twinning, electron backscatter diffraction, plasticity, first-principles
National Category
Metallurgy and Metallic Materials
Research subject
Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-29982DOI: 10.1016/j.actamat.2019.04.057ISI: 000472812300005Scopus ID: 2-s2.0-85065259834OAI: oai:DiVA.org:du-29982DiVA, id: diva2:1314026
Available from: 2019-05-07 Created: 2019-05-07 Last updated: 2019-07-23Bibliographically approved

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Molnar, DavidEngberg, Göran

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CiteExportLink to record
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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