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A microstructural investigation of roll formed austenitic stainless steel
Dalarna University, School of Technology and Business Studies, Materials Technology.ORCID iD: 0000-0002-4359-4967
Dalarna University, School of Technology and Business Studies, Materials Technology.
2013 (English)In: Sheet metal 2013: Key engineering metals, 2013, Vol. 549, 364-371 p.Conference paper, (Refereed)
Abstract [en]

Due to high production rates and the possibility to form complex geometries roll forming has become an increasingly popular forming process for sheet metal. Increasing quantities of high strength steels are used today but can be difficult to form due to their low ductility. One way to partly overcome this problem is to heat the steel in the forming area thus locally increasing the ductility. In the present study partially heated cold rolled high strength AISI 301 type austenitic stainless steel was investigated using electron backscattered diffraction (EBSD), and the results were compared to microhardness measurements. The results show that partial heating will give an almost complete reverse martensite transformation, i.e. martensite (alpha') transforms to austenite (gamma), close to the surfaces and grain growth in the middle of the steel sheet. The extension of the heat affected zone can be determined using either microhardness or EBSD measurements. Both these measurements can be used to determine the position of the neutral layer after roll forming. The hardness measurement cannot distinguish between microstructural features but the results are in good agreement with the EBSD results for volume fraction of alpha'-martensite. A major advantage of using EBSD is the possibility to characterize and follow the microstructural development when heating and roll forming.

Place, publisher, year, edition, pages
2013. Vol. 549, 364-371 p.
Keyword [en]
Austenitic stainless steel, EBSD, High strength steel, Microstructure, Roll forming
National Category
Materials Engineering
Research subject
Stålformning och ytteknik
Identifiers
URN: urn:nbn:se:du-18335DOI: 10.4028/www.scientific.net/KEM.549.364ISI: 000321156900046OAI: oai:DiVA.org:du-18335DiVA: diva2:827946
Conference
15th International Conference on Sheet Metal (SheMet 2013), MAR 25-27, 2013, Belfast, NORTH IRELAND
Available from: 2015-06-29 Created: 2015-06-25 Last updated: 2016-10-31Bibliographically 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