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Effects of process parameters prior to annealing on the formability of two cold rolled dual phase steels
2008 (English)In: STEEL RES INT, ISSN 1611-3683, Vol. 79, no 4, 297-305 p.Article in journal (Refereed) Published
Abstract [en]

This study concerns the effects of coiling temperature after hot rolling and the degree of reduction during cold rolling on formability-related properties of high strength cold rolled dual phase (DP) steels. The effect of coiling temperature on the final structure and properties of two cold rolled and annealed DIP-steels is investigated. Further, the effect of cold rolling reduction and its impact on the final properties of the material is studied. Aspects of the impact of the different process parameters on the ferrite to austenite and austenite to martensite transformation are discussed based on results from production scale experiments, tensile testing and metallographic examinations of the materials.

Place, publisher, year, edition, pages
2008. Vol. 79, no 4, 297-305 p.
Keyword [en]
cold rolled dual phase steels, coiling temperature, cold rolling reduction, mechanical properties, formability, microstructure, banding, niobium, manganese
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-24972DOI: 10.1002/srin.200806354ISI: 000256177900007OAI: oai:DiVA.org:kth-24972DiVA: diva2:354757
Note

QC 20101004

Available from: 2010-10-04 Created: 2010-10-04 Last updated: 2017-06-08Bibliographically approved
In thesis
1. Structure and mechanical properties of dual phase steels: An experimental and theoretical analysis
Open this publication in new window or tab >>Structure and mechanical properties of dual phase steels: An experimental and theoretical analysis
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

 

Place, publisher, year, edition, pages
Stockholm: KTH, 2010
Keyword
Dual phase steels, continuous annealing, dilatometry, microstructure, mechanical properties, process parameters, dislocation model, plastic deformation
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-24869 (URN)
Public defence
2010-10-27, Nya konferensrummet, Brinellvägen 23, Stockholm, 16:20 (English)
Opponent
Supervisors
Note
QC 20101004Available from: 2010-10-04 Created: 2010-09-28 Last updated: 2010-10-06Bibliographically approved

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