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Residual Stresses in Dengeling-Treated Aluminum Alloy AA 7050
Saab Aeronautics, Linköping.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Saab Aeronautics, Linköping.
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2017 (English)In: Residual Stresses 2016: ICRS-10, Materials Research Proceedings 2 (2017), Materials Research Foum , 2017, Vol. 2, 425-430 p.Conference paper, Published paper (Refereed)
Abstract [en]

Dengeling is a new method for mechanical surface treatment of metallic parts to enhance fatigue properties. The treatment produces consecutive lines of indents by a spherical indenter, resulting in compressive residual stresses in a surface layer. This paper investigated residual stresses, surface roughness and near surface deformation, in specimens of AA 7050 T7451 after different dengeling treatments. The effect of indent overlap (0%, 25% and 50%) and indenter size (∅3 and ∅8 mm) were studied. X-Ray diffraction measurements revealed that plastic deformation and compressive residual stresses were generated in a surface layer of about 1 mm by treatments using the ∅3 mm indenter and about 1.2 mm by treatment using the ∅8 mm indenter. Anisotropic residual stress fields were observed with higher compressive residual stresses (-360 MPa for 50% indent overlap, independent of indenter size) perpendicular to indent lines and lower (max -270 MPa for all the treatments) parallel to indent lines. Increasing the overlap between indents gave higher subsurface compressive residual stresses only in the transverse direction of indent lines. It also reduced the surface roughness. Best surface finish (Ra below 1 μm) was obtained when using the ∅8 mm indenter and 50% indent overlap.

Place, publisher, year, edition, pages
Materials Research Foum , 2017. Vol. 2, 425-430 p.
Series
Materials Research Proceedings, ISSN 2474-395X ; 2
Keyword [en]
Dengling, Mechanical Surface Treatment, Aluminum Alloy, Residual Stress, Roughness
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-134365DOI: 10.21741/9781945291173-72ISI: 000401041500072ISBN: 9781945291166 (print)ISBN: 9781945291173 (electronic)OAI: oai:DiVA.org:liu-134365DiVA: diva2:1072173
Conference
International Conference Residual Stress ICRS-10, 4-8 July 2016, Sydney, Australien.
Available from: 2017-02-07 Created: 2017-02-07 Last updated: 2017-06-13Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
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  • asciidoc
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