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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
Keywords [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: 2019-01-04
In thesis
1. Crack growth in single crystal nickel base superalloys under isothermal and thermomechanical fatigue
Open this publication in new window or tab >>Crack growth in single crystal nickel base superalloys under isothermal and thermomechanical fatigue
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This work concerns the fatigue crack growth behaviour of nickel base single crystal superalloys. The main industrial application of this class of materials is in gas turbine blades, where the ability to withstand severe mechanical loading in combination with high temperatures is required. In order to ensure the structural integrity of gas turbine blades, knowledge of the fatigue crack growth behaviour under service-like conditions is of utmost importance. The aim of the present work is both to improve the understanding of the crack growth behaviour of single crystal superalloys and also to improve the testing and evaluation methodology for crack propagation under thermomechanical fatigue loading conditions. Single crystal superalloys have anisotropic mechanical properties and are prone to localization of inelastic deformation along the close-packed planes of the crystal lattice. Under some conditions, crystallographic crack growth occurs along these planes and this is a complicating factor throughout the whole chain of crack propagation life simulation; from material data generation to component calculation. Fatigue crack growth testing has been performed, both using conventional isothermal testing methods and also using thermomechanical fatigue crack growth testing. Experimental observations regarding crystallographic crack growth have been made and its dependence on crystal orientation and testing temperature has been investigated. Quantitative crack growth data are however only presented for the case of Mode I crack growth under isothermal as well as thermomechanical fatigue conditions. Microstructural investigations have been undertaken to investigate the deformation mechanisms governing the crack growth behaviour. A compliance based method for the evaluation of crack opening force under thermomechanical fatigue conditions was developed, in order to enable a detailed analysis of the test data. The crack opening force evaluation proved to be of key importance in the understanding of the crack driving force under different testing conditions.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2019. p. 44
Series
Linköping Studies in Science and Technology. Licentiate Thesis, ISSN 0280-7971 ; 1829
National Category
Materials Engineering Applied Mechanics Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:liu:diva-153619 (URN)10.3384/lic.diva-153619 (DOI)9789176851500 (ISBN)
Presentation
2019-01-25, ACAS, A-huset, Campus Valla, Linköpings universitet, Linköping, 09:19 (Swedish)
Opponent
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Note

In the printed version of the thesis the series name Linköping Studies in Science and Technology Licentiate of engineering thesis is incorrect. The correct series name is Linköping Studies in Science and Technology Licentiate thesis.

Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-07Bibliographically approved

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