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Induktiv provning av ferritiskt rostfritt stå
Dalarna University, School of Technology and Business Studies, Material Science.
2011 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Eddy current testing on ferritic stainless steel (English)
Abstract [en]

The report examines the factors which may be a contributing cause to the problems that are present when ferritic stainless steel are eddy current tested in a warm condition. The work is carried out at Fagersta Stainless AB in Fagersta which manufactures stainless steel wire. In the rolling mill there is an eddy current equipment for detection of surface defects on the wire. The ferritic stainless steels cause a noise when testing and this noise complicates the detection of defects.Because of this, a study was made of how the noise related to factors such as steel grade, temperature, size and velocity. By observing the signal and with the possibilities to change the equipment settings the capability to let a signal filter reduce the noise level were evaluated. Theories about the material's physical properties have also been included, mainly the magnetic properties, electrical conductivity and the material's tendency to oxidize.Results from the tests show that a number of factors do not affect the inductive test significantly and to use a filter to reduce the noise level does not seem to be a viable option. The level of noise does not relate to the presence of superficial particles in form of oxides.The ferritic stainless steels showed some difference in noise level. Which noise level there was did match well with the steels probability for a precipitation of a second phase, and precipitation of austenite may in this case contribute to noise when using an eddy current instrument.The noise is probably due to some physical material property that varies within the thread.

Place, publisher, year, edition, pages
2011. , 54 p.
Keyword [en]
Non destructive testing, Eddy current testing, Stainless steel, Ferritic, Wire rod
Keyword [sv]
Oförstörande provning, Induktiv provning, Rostfritt stål, Ferrit, Virvelströmsprovning, Valstråd
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:du-10039OAI: oai:DiVA.org:du-10039DiVA: diva2:524498
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-05-02 Created: 2012-05-02 Last updated: 2012-05-02Bibliographically approved

Open Access in DiVA

Fulltext(1919 kB)1062 downloads
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File name FULLTEXT01.pdfFile size 1919 kBChecksum SHA-512
135b912d59e2f3db56bf55008df01d6d76cbbd7f40a53facfbf9adb6cba8ca625280f611fbc3ff01a2dfda22abd1a679888cf4dbb835fda0d15b85679baf7e02
Type fulltextMimetype application/pdf

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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