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Fatigue crack growth behaviour of an alternative single crystal nickel base superalloy
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering. Siemens Ind Turbomachinery AB, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8304-0221
Siemens Ind Turbomachinery AB, Sweden.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.
2018 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 109, p. 166-181Article in journal (Refereed) Published
Abstract [en]

The fatigue crack growth behaviour of a single crystal nickel base superalloy was studied at three different temperatures (20 degrees C, 500 degrees C and 750 degrees C) and three different crystallographic orientations. At the highest testing temperature, the influence of hold time at maximum load was also evaluated. Under some of the testing conditions, crystallographic crack growth occurred along {1 1 1} planes, which were non-perpendicular to the loading direction. The propensity for crystallographic cracking was observed to be strongly temperature dependent with a maximum occurring at the intermediate testing temperature of 500 degrees C. During non-crystallographic, Mode I crack growth the crack tended to avoid the gamma particles and propagated preferentially through the gamma matrix.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2018. Vol. 109, p. 166-181
Keyword [en]
Single crystal superalloy; Fatigue; Crack growth; Crystallographic crack growth; Temperature dependence; Orientation dependence; Hold time influence
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:liu:diva-145431DOI: 10.1016/j.ijfatigue.2017.12.003ISI: 000425073100017OAI: oai:DiVA.org:liu-145431DiVA, id: diva2:1194653
Note

Funding Agencies|Siemens Industrial Turbomachinery AB in Finspang, Sweden; Swedish Energy Agency, via the Research Consortium of Materials Technology for Thermal Energy Processes [KME-702]

Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2018-04-03

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