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Effect of crystal orientation and texture on fatigue crack evolution in high strength steel welds
SINTEF Mat & Chem, Oslo, Norway.
University West, Department of Engineering Science, Division of Production Engineering. (Welding group, PTW)ORCID iD: 0000-0003-2560-0531
SINTEF Mat & Chem, Oslo, Norway.
2015 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 77, 95-104 p.Article in journal (Refereed) Published
Abstract [en]

In the present study, electron backscattered diffraction is used to analyze the fatigue crack evolution in a high strength steel weld that was loaded cyclically in the plastic regime. Three prominent regions of a fatigue crack are investigated separately: crack tip, crack trajectory and crack initiation. Taylor and Schmid factors are mapped with respect to the defined loading matrix. Possible effective mechanisms are proposed based on the local plasticity properties like lattice rotation and misorientation. The analyses of the crack tip and trajectory regions show that although the critical resolved shear stresses in some regions are low, small deformation resistance of these regions can compromise the dislocation immobility and cause local fracture. It is shown that if the crack grows transgranularly, at least one side of the crack may show low lattice rotation or strain equivalent values, which indicates the relaxation of elastic stresses after fracture. The crack initiation is determined to be dominantly controlled by transcrystalline mechanism of initiation that takes place under plastic loading conditions. It is also shown that the secondary < 123 >11 (1) over bar type of slip systems were the most activated under such loading conditions. (C) 2015 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
2015. Vol. 77, 95-104 p.
Keyword [en]
Crystal orientation; Torsion; Fatigue; EBSD; Crack trajectory
National Category
Other Materials Engineering Applied Mechanics
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-7613DOI: 10.1016/j.ijfatigue.2015.03.008ISI: 000354147300009Scopus ID: 2-s2.0-84925705593OAI: oai:DiVA.org:hv-7613DiVA: diva2:815925
Note

Available online 14 March 2015

Available from: 2015-06-02 Created: 2015-05-30 Last updated: 2016-02-10Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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More styles
Language
  • de-DE
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