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Behaviour of surface defects in wire rod rolling.
National Post Gradual School in Metal Forming, Dalarna University.
Fsgersta Stainless AB.
Mechanical Engineering, Department of Technology, Örebro University .
2006 (English)In: STEEL RES INT, ISSN 1611-3683, Vol. 77, no 6, 439-444 p.Article in journal (Refereed) Published
Abstract [en]

Defects are often present in rolled products, such as wire rod. The market demand for wire rod without any defects has increased. In the final wire rod products, defects originating from steel making, casting, pre-rolling of billets and during wire rod rolling can appear. In this work, artificial V-shaped longitudinal surface cracks have been analysed experimentally and by means of FEM. The results indicate that the experiments and FEM calculations show the same tendency except in two cases, where instability due to fairly "round" false round bars disturbed the experiment. FE studies in combination with practical experiments are necessary in order to understand the behaviour of the material flows in the groove and to explain whether the crack will open up as a V-shape or if it will be closed as an I-shape.

Place, publisher, year, edition, pages
2006. Vol. 77, no 6, 439-444 p.
Keyword [en]
artificial surface cracks, wire rod, working range, roll pass design, FE-analysis
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-25923ISI: 000238898200010OAI: oai:DiVA.org:kth-25923DiVA: diva2:360861
Note
QC 20101105Available from: 2010-11-05 Created: 2010-11-05 Last updated: 2010-11-05Bibliographically approved
In thesis
1. Evolution of artificial defects during shape rolling
Open this publication in new window or tab >>Evolution of artificial defects during shape rolling
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Very often defects are present in rolled products. For wire rods, defects are very deleterious since the wire rods are generally used directly in various applications. For this reason, the market nowadays requires wire rods to be completely defect-free. Any wire with defects must be rejected as scrap which is very costly for the production mill. Thus, it is very important to study the formation and evolution of defects during wire rod rolling in order to better understand and minimize the problem, at the same time improving quality of the wire rods and reducing production costs.

The present work is focused on the evolution of artificial defects during rolling. Longitudinal surface defects are studied during shape rolling of an AISI M2 high speed steel and a longitudinal central inner defect is studied in an AISI 304L austenitic stainless steel during ultra-high-speed wire rod rolling. Experimental studies are carried out by rolling short rods prepared with arteficial defects. The evolution of the defects is characterised and compared to numerical analyses. The comparison shows that surface defects generally reduce quicker in the experiments than predicted by the simulations whereas a good agreement is generally obtained for the central defect.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. v, 32 p.
Keyword
shape rolling, wire rod rolling, artificial defects, defect evolution, surface cracks, porosity, FEM, high speed steel, stainless steel
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-4350 (URN)978-91-7178-614-2 (ISBN)
Presentation
2007-04-24, Konferensrummet, K408, KTH, Brinellvägen 23, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101105Available from: 2007-05-04 Created: 2007-05-04 Last updated: 2010-11-05Bibliographically approved

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