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Evolution of artificial defects during shape rolling
Dalarna University, School of Technology and Business Studies, Material Science.
2007 (English)Licentiate thesis, comprehensive summary (Other academic)
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: Kungliga tekniska högskolan , 2007.
Keyword [en]
shape rolling, wire rod rolling, artificial defects, defect evolution, surface cracks, porosity, FEM, high speed steel, stainless steel
National Category
Engineering and Technology
Research subject
Stålformning och ytteknik, Initiering och utveckling av defekter under spårvalsning
Identifiers
URN: urn:nbn:se:du-5215OAI: oai:dalea.du.se:5215DiVA: diva2:523414
Available from: 2011-01-17 Created: 2011-01-17 Last updated: 2012-08-13Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • 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