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A dislocation based theory for the deformation hardening behavior of DP-steels: Impact of martensite content and ferrite grain size
Product Development/Materials Research, Borlänge, Sweden.
2010 (Engelska)Ingår i: Journal of Metallurgy, ISSN 1687-9465, E-ISSN 1687-9473, Vol. 2010, nr 647198Artikel i tidskrift (Refereegranskat) 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(ε), 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.

Ort, förlag, år, upplaga, sidor
2010. Vol. 2010, nr 647198
Nyckelord [en]
DP-steels, dislocation model, inhomogeneous deformation hardening, martensite content, ferrite grain size
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
URN: urn:nbn:se:kth:diva-24980DOI: 10.1155/2010/647198OAI: oai:DiVA.org:kth-24980DiVA, id: diva2:354797
Anmärkning

QC 20101004. Updated from submitted to Epub ahead of print, 20120315. Updated from Epub ahead of print to print 20131126

Tillgänglig från: 2010-10-04 Skapad: 2010-10-04 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. Structure and mechanical properties of dual phase steels: An experimental and theoretical analysis
Öppna denna publikation i ny flik eller fönster >>Structure and mechanical properties of dual phase steels: An experimental and theoretical analysis
2010 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The key to the understanding of the mechanical behavior of dual phase (DP) steels is to a large extent to be found in the microstructure. The microstructure is in its turn a result of the chemical composition and the process parameters during its production. In this thesis the connection between microstructure and mechanical properties is studied, with focus on the microstructure development during annealing in a continuous annealing line. In-line trials as well as the lab simulations have been carried out in order to investigate the impact of alloying elements and process parameters on the microstructure. Further, a dislocation model has been developed in order to analyze the work hardening behavior of DP steels during plastic deformation.

From the in-line trials it was concluded that there is an inheritance from the hot rolling process both on the microstructure and properties of the cold rolled and annealed product. Despite large cold rolling reductions, recrystallization and phase transformations, the final dual phase steel is still effected by process parameters far back in the production chain, such as the coiling temperature following the hot rolling.

Lab simulations showed that the microstructure and consequently the mechanical properties are impacted not only by the chemical composition of the steel but also by a large number of process parameters such as soaking temperature, cooling rate prior to quenching, quench and temper annealing temperature.

 

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2010
Nyckelord
Dual phase steels, continuous annealing, dilatometry, microstructure, mechanical properties, process parameters, dislocation model, plastic deformation
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
urn:nbn:se:kth:diva-24869 (URN)
Disputation
2010-10-27, Nya konferensrummet, Brinellvägen 23, Stockholm, 16:20 (Engelska)
Opponent
Handledare
Anmärkning
QC 20101004Tillgänglig från: 2010-10-04 Skapad: 2010-09-28 Senast uppdaterad: 2010-10-06Bibliografiskt granskad

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