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A dislocation based theory for the deformation hardening behavior of DP steels: Impact of martensite content and ferrite grain size
Högskolan Dalarna, Akademin Industri och samhälle, Materialvetenskap.
2010 (engelsk)Inngår i: Journal of Metallurgy, ISSN 1687-9465Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Hindawi Publishing Corporation , 2010.
Emneord [en]
DP steels, dislocation model, inhomogeneous deformation hardening, martensite content, ferrite grain size
HSV kategori
Forskningsprogram
Stålformning och ytteknik, Mikrostrukturutveckling i avancerade höghållfasta stål
Identifikatorer
URN: urn:nbn:se:du-5138DOI: 10.1155/2010/647198OAI: oai:dalea.du.se:5138DiVA, id: diva2:520289
Tilgjengelig fra: 2010-12-10 Laget: 2010-12-10 Sist oppdatert: 2014-10-06bibliografisk kontrollert

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