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Influence of composition, grain size and manufacture process on the anisotropy of tube materials
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
2010 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A problem with cold pilgered tubes for OCTG applications is that they can get anisotropic properties with regard to yield strength. One source of anisotropy is texture that is developed during the cold deformation. EBSD measurements have been made on several austenitic stainless steels with different deformations to see what influence the composition has on the texture formation. The same measurements were used to study the influence of grain size on texture formation. The conclusion was that the composition can have an impact on the texture and hence has potential to also affect the anisotropy. The differences in texture cannot be associated with a specific alloying element, but is rather a synergetic effect. It was also concluded that grain structure has no strong influence on texture formation. An evaluation of three different tool designs used for cold pilgering was made. The designs evaluated are referred to as design A, B and C. EBSD measurements showed large deviations in texture in the middle of the wall compared to close to the surface of pilgered OCTG. However, the measurements showed no large differences between the three designs and the texture could not be coupled to the anisotropy.

Place, publisher, year, edition, pages
2010. , p. 62
Series
UPTEC Q, ISSN 1401-5773 ; 10004
Keywords [en]
Anisotropy, austenitic stainless steel, cold deformation, texture
Identifiers
URN: urn:nbn:se:uu:diva-125336OAI: oai:DiVA.org:uu-125336DiVA, id: diva2:319410
Presentation
(English)
Uppsok
Technology
Supervisors
Examiners
Available from: 2010-05-25 Created: 2010-05-17 Last updated: 2010-05-25Bibliographically approved

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CiteExportLink to record
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  • apa
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