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Crystallographic crack propagation rate in single-crystal nickel-base superalloys
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-1688-9732
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering. Siemens Ind Turbomachinery AB, Sweden.
Fracture Anal Consultants Inc, NY USA.
Siemens Ind Turbomachinery AB, Sweden.
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2018 (English)In: 12TH INTERNATIONAL FATIGUE CONGRESS (FATIGUE 2018), E D P SCIENCES , 2018, Vol. 165, article id 13012Conference paper, Published paper (Refereed)
Abstract [en]

Single-crystal nickel-base superalloys are often used in the hot sections of gas turbines due to their good mechanical properties at high temperatures such as enhanced creep resistance. However, the anisotropic material properties of these materials bring many difficulties in terms of modelling and crack growth prediction. Cracks tend to switch cracking mode from Mode I cracking to crystallographic cracking. Crystallographic crack growth is often associated with a decrease in crack propagation life compared to Mode I cracking and this must be taken into account for reliable component lifing. In this paper a method to evaluate the crystallographic crack propagation rate related to a crystallographic crack driving force parameter is presented. The crystallographic crack growth rate is determined by an evaluation of heat tints on the fracture surface of a specimen subjected to fatigue loading. The complicated crack geometry including two crystallographic crack fronts is modelled in a three dimensional finite element context. The crack driving force parameter is determined by calculating anisotropic stress intensity factors along the two crystallographic crack fronts by finite-element simulations and post-processing the data in a fracture mechanics tool that resolves the stress intensity factors on the crystallographic slip planes in the slip directions. The evaluated crack propagation rate shows a good correlation for both considered crystallographic cracks fronts.

Place, publisher, year, edition, pages
E D P SCIENCES , 2018. Vol. 165, article id 13012
Series
MATEC Web of Conferences, ISSN 2261-236X
National Category
Infrastructure Engineering
Identifiers
URN: urn:nbn:se:liu:diva-159901DOI: 10.1051/matecconf/201816513012ISI: 000478990600114OAI: oai:DiVA.org:liu-159901DiVA, id: diva2:1346109
Conference
12th International Fatigue Congress (FATIGUE)
Note

Funding Agencies|Swedish Energy Agency; Siemens industrial Turbomachinery AB through Research Consortium of Materials Technology for Thermal Energy Processes [KME-702]

Available from: 2019-08-27 Created: 2019-08-27 Last updated: 2019-09-23

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
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  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
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  • asciidoc
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