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Study of the alternative mechanism behind the constant strain hardening rate in high‑nitrogen 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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2020 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 170, article id 110726Article in journal (Refereed) Published
Abstract [en]

In this study, three austenitic stainless steels with different compositions are compared in terms of their deformation behaviour. Two of the investigated steels have considerable high nitrogen content which affects their deformation behaviour. The deformation properties and microstructure of the materials were studied by tensile testing and electron backscatter diffraction. We observe that the strain hardening rate curve of the alloy with low nitrogen content shows a continuously decreasing slope, whereas those of the high‑nitrogen steels exhibit a clear plateau. Since no twinning or ε-phase formation is observed at the corresponding strain levels, we suggest that the addition of a large amount of nitrogen suppresses cross-slip and promotes dislocation planarisation. The microstructural evolution of the materials during deformation supports the above scenario. Based on the results of the ab initio calculations, the deformation behaviour of high‑nitrogen alloys cannot be explained in terms of the stacking fault energy.

Place, publisher, year, edition, pages
2020. Vol. 170, article id 110726
Keywords [en]
Stainless steel, Nitrogen, Microstructure, Deformation twinning, First principles, Stacking fault energy
National Category
Metallurgy and Metallic Materials
Research subject
Research Profiles 2009-2020, Steel Forming and Surface Engineering
Identifiers
URN: urn:nbn:se:du-35328DOI: 10.1016/j.matchar.2020.110726ISI: 000598515400002Scopus ID: 2-s2.0-85094823655OAI: oai:DiVA.org:du-35328DiVA, id: diva2:1486543
Available from: 2020-11-02 Created: 2020-11-02 Last updated: 2021-11-12Bibliographically 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
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Output format
  • html
  • text
  • asciidoc
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