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The effect of random grain distributions on fatigue crack initiation in a notched coarse grained superalloy specimen
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
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2012 (English)In: Computational materials science, ISSN 0927-0256, E-ISSN 1879-0801, Vol. 51, no 1, 273-280 p.Article in journal (Refereed) Published
Abstract [en]

Coarse grained superalloys are of large interest in high temperature applications, and can be found in e.g.gas turbine components, where great care must be given with respect to high temperature fatigue. Due tothe large grain size, the material behaviour at e.g. sharp notches cannot be considered homogeneous. As aconsequence, the fatigue behaviour is likely to expose a large variation. In order to numerically investigatethis variation, a Monte Carlo analysis has been carried out by 100 FE-simulations of notched specimens,where placements and orientations of the grains were randomised. Furthermore, each grain wasmodelled as a unique single-crystal, displaying both anisotropic elastic and plastic behaviour and tension/compression asymmetry. The effect of randomness was investigated by the obtained dispersion infatigue crack initiation life. It was concluded that the fatigue life behaviour of coarse grained nickel-basesuperalloys may show a considerable variation, which cannot be captured by one single deterministicanalysis based on data for a homogenised material. Furthermore, the dispersion is of such a magnitudethat it needs to be taken into account in industrial applications where highly stressed coarse grainedmaterials are used.

Place, publisher, year, edition, pages
Elsevier , 2012. Vol. 51, no 1, 273-280 p.
Keyword [en]
Coarse grained superalloy, Fatigue crack initiation, Critical plane approach, Crystal plasticity, Monte Carlo analysis
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:liu:diva-72092DOI: 10.1016/j.commatsci.2011.07.054ISI: 000296214300034OAI: oai:DiVA.org:liu-72092DiVA: diva2:457022
Note
Funding agencies|Swedish Research Council| 60628701 |Siemens Industrial Turbomachinery AB in Sweden||Swedish Energy Agency via the Research Consortium of Materials Technology for Thermal Energy Processes| KME-502 |National Supercomputer Centre in Linkoping, Sweden||Available from: 2011-11-16 Created: 2011-11-16 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Crystal plasticity and crack initiation in a single-crystal nickel-base superalloy: Modelling, evaluation and appliations
Open this publication in new window or tab >>Crystal plasticity and crack initiation in a single-crystal nickel-base superalloy: Modelling, evaluation and appliations
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this dissertation the work done in the projects KME-410/502 will be presented.The overall objective in these projects is to evaluate and develop tools for designingagainst fatigue in single-crystal nickel-base superalloys in gas turbines. Experimentshave been done on single-crystal nickel-base superalloy specimens in order toinvestigate the mechanical and fatigue behaviour of the material. The constitutivebehaviour has been modelled and veried by FE-simulations of the experiments.Furthermore, the microstructural degradation during long-time ageing has been investigatedwith respect to the material's yield limit. The eect has been includedin the constitutive model by lowering the resulting yield limit. Moreover, the fatiguecrack initiation of a component has been analysed and modelled by using acritical plane approach in combination with a critical distance method. Finally, asan application, the derived single-crystal model was applied to all the individualgrains in a coarse grained specimen to predict the dispersion in fatigue crack initiationlife depending on random grain distributions.

This thesis is divided into three parts. In the rst part the theoretical framework,based upon continuum mechanics, crystal plasticity, the critical plane approachand the critical distance method, is derived. This framework is then used in thesecond part, which consists of six included papers. Finally, in the third part, detailsof the used numerical procedures are presented.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 59 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1410
Keyword
Single-crystal superalloy, Crystal plasticity, Fatigue crack initiation, Critical plane model, Theory of critical distance, Rafting, Tension/compression asymmetry
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-72093 (URN)978-91-7393-022-2 (ISBN)
Public defence
2011-12-16, C3, Hus C, Campus Valla, Linköpings universitet, Linköping, 10:15 (Swedish)
Opponent
Supervisors
Available from: 2011-11-16 Created: 2011-11-16 Last updated: 2011-12-05Bibliographically approved

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Leidermark, DanielGustafsson, DavidMoverare, JohanSimonsson, Kjell

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