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
Influence of niobium and coiling temperature on the mechanical properties of a cold rolled dual phase steel
2007 (English)In: Revue de Metallurgie, ISSN 1156-3141, Vol. 104, no 4, p. 191-197Article in journal (Refereed) Published
Abstract [en]

Dual-phase (ferrite-martensite) low-carbon sheet steels are produced by annealing in the intercritical temperature range to produce ferrite-austenite mixtures, followed by accelerated cooling to transform the austenite phase into martensite. Dual-phase steels have gained considerable importance over the conventional HSLA steels due to the high strength and formability achieved. A good formability is achieved by high deformation hardening, due to a fine distribution of martensite. A cold rolled DP-grade (TS 600 MPa), coiled at 550 °C, was compared with a steel of approximately the same analysis but with the addition of 0.015 wt% Nb, coiled at 520 and 600 °C respectively. The Nb-addition refines the ferrite grain size substantially and a more uniform grain shape is achieved. The smaller grain size of the ferrite- and martensite phases, results in a material with better formability. It appears that coiling at 520°C results in a slightly better formability than coiling at 600°C. The material shows a lower a?? start temperature, probably due to easier dissolution of finer carbides, compared to the strip coiled at 600°C. The recrystallization and phase transformation behaviour was studied using laser ultrasonics (LUS). Developing the LUS-technique for use in-line during annealing would open new ways of optimising and controlling the mechanical properties of the final strip.

Place, publisher, year, edition, pages
Revue de Metallurgie , 2007. Vol. 104, no 4, p. 191-197
Research subject
Stålformning och ytteknik, Mikrostrukturutveckling i avancerade höghållfasta stål
Identifiers
URN: urn:nbn:se:du-3483OAI: oai:dalea.du.se:3483DiVA, id: diva2:519968
Available from: 2008-11-17 Created: 2008-11-17 Last updated: 2012-04-24Bibliographically approved

Open Access in DiVA

No full text in DiVA

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 653 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