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A dislocation based theory for the deformation hardening behavior of DP steels: Impact of martensite content and ferrite grain size
Dalarna University, School of Technology and Business Studies, Material Science.
2010 (English)In: Journal of Metallurgy, ISSN 1687-9465Article in journal (Refereed) Published
Abstract [en]

A dislocation model, accurately describing the uniaxial plastic stress-strain behavior of dual phase (DP) steels, is proposed and the impact of martensite content and ferrite grain size in four commercially produced DP steels is analyzed. It is assumed that the plastic deformation process is localized to the ferrite. This is taken into account by introducing a non-homogeneity parameter, f(e), that specifies the volume fraction of ferrite taking active part in the plastic deformation process. It is found that the larger the martensite content the smaller the initial volume fraction of active ferrite which yields a higher initial deformation hardening rate. This explains the high energy absorbing capacity of DP steels with high volume fractions of martensite. Further, the effect of ferrite grain size strengthening in DP steels is important. The flow stress grain size sensitivity for DP steels is observed to be 7 times larger than that for single phase ferrite.

Place, publisher, year, edition, pages
Hindawi Publishing Corporation , 2010.
Keyword [en]
DP steels, dislocation model, inhomogeneous deformation hardening, martensite content, ferrite grain size
National Category
Materials Engineering
Research subject
Stålformning och ytteknik, Mikrostrukturutveckling i avancerade höghållfasta stål
Identifiers
URN: urn:nbn:se:du-5138DOI: 10.1155/2010/647198OAI: oai:dalea.du.se:5138DiVA: diva2:520289
Available from: 2010-12-10 Created: 2010-12-10 Last updated: 2014-10-06Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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