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Influence of dwell time on fatigue crack propagation in Alloy 718 laser welds
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
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2017 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 704, 440-447 p.Article in journal (Refereed) Published
Abstract [en]

The introduction of welded assemblies in aerospace components aid in weight reduction, but also lead to an increased risk of defects. It is therefore important to analyze the high temperature crack growth resistance of such welds. The results from high temperature cyclic and dwell-fatigue testing of surface flawed Alloy 718 welds are presented here. An increasing temperature and application of a dwell time accelerate the crack growth and increase interaction with secondary phases. During cyclic loading at 550 °C, there is little interaction with the microstructure during transgranular propagation, but the application of dwell times results in a mixture of transgranular propagation and intergranular cracking of boundaries between different dendrites. At 650 °C, mixed intergranular and transgranular mode of crack growth is seen under both cyclic and dwell conditions. However, during dwell-fatigue the interfaces between the secondary arms of the same dendrite are also weakened, leading to an interfacial type of crack growth also in the intergranular parts.

Place, publisher, year, edition, pages
2017. Vol. 704, 440-447 p.
Keyword [en]
Crack growth, Dwell-fatigue, EBSD, Electron microscopy, Laser welds, Nickel superalloys, Crack propagation, Cracks, Fatigue crack propagation, Fatigue testing, Stress corrosion cracking, Textures, Welds, Aerospace components, Dwell fatigue, Increasing temperatures, Intergranular cracking, Nickel superalloy, Transgranular modes, Fatigue of materials
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-31339DOI: 10.1016/j.msea.2017.08.049Scopus ID: 2-s2.0-85027569766OAI: oai:DiVA.org:ri-31339DiVA: diva2:1147598
Available from: 2017-10-06 Created: 2017-10-06 Last updated: 2017-10-06Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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More styles
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  • en-GB
  • en-US
  • fi-FI
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  • Other locale
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