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Modelling of constitutive and fatigue behaviour of a single-crystal nickel-base superalloy
Linköping University, Department of Management and Engineering, Solid Mechanics . Linköping University, The Institute of Technology.
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this licentiate thesis the work done in the project KME410 will be presented. The overall objective of this project is to evaluate and develop tools for designing against fatigue in single-crystal nickel-base superalloys in gas turbines. Experiments have been done on single-crystal nickel-base superalloy specimens in order to investigate the mechanical behaviour of the material. The constitutive behaviour has been modelled and verified by simulations of the experiments. Furthermore, the  microstructural degradation during long-time ageing has been investigated with  respect to the component’s yield limit. The effect has been included in the  constitutive model by lowering the resulting yield limit. Finally, the fatigue crack  initiation of a component has been analysed and modelled by using a critical plane approach.

This thesis is divided into three parts. In the first part the theoretical framework, based upon continuum mechanics, crystal plasticity and the critical plane approach, is derived. This framework is then used in the second part, which consists of three included papers. Finally, in the third part, details are presented of the used  numerical procedures.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press , 2010. , 49 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1324
Keyword [en]
Single-crystal nickel-base superalloys, crystal plasticity, tension/compression asymmetry, rafting, fatigue initiation, critical plane approach
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:liu:diva-56288Local ID: LIU{TEK{LIC{2010:7ISBN: 978-91-7393-384-1 (print)OAI: oai:DiVA.org:liu-56288DiVA: diva2:318380
Presentation
2010-06-17, C3, C-huset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2010-05-25 Created: 2010-05-07 Last updated: 2010-05-25Bibliographically approved
List of papers
1. Room temperature yield behaviour of a single-crystal nickel-base superalloy with tension/compression asymmetry
Open this publication in new window or tab >>Room temperature yield behaviour of a single-crystal nickel-base superalloy with tension/compression asymmetry
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2009 (English)In: Computational materials science, ISSN 0927-0256, Vol. 47, no 2, 366-372 p.Article in journal (Refereed) Published
Abstract [en]

The constitutive behaviour at room temperature of a single-crystal nickel-base superalloy is presented in a new model. This model is based on crystal plasticity and takes Schmid- as well as non-Schmid stresses, elastic anisotropy and tension/compression asymmetry into account. By comparison with uniaxial tensile and compressive tests, the model is shown to reproduce the real behaviour well, including the tension/compression asymmetry. The model also shows that typically encountered deviations in orientations ofcastings have a non-negligible influence on stiffness and yield limit, which must be taken into account for industrial applications.

Keyword
Tension/compression asymmetry, Single-crystal superalloy, Crystal plasticity, Yield surface
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-50547 (URN)10.1016/j.commatsci.2009.08.012 (DOI)
Available from: 2009-10-12 Created: 2009-10-12 Last updated: 2011-12-05
2. Tension/Compression asymmetry of a single-crystal superalloy in virgin and degraded condition
Open this publication in new window or tab >>Tension/Compression asymmetry of a single-crystal superalloy in virgin and degraded condition
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2010 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 58, no 15, 4986-4997 p.Article in journal (Refereed) Published
Abstract [en]

The mechanical behaviour at room temperature of a single-crystal superalloy exposed to long term ageing at elevated temperature has been investigated, a topic important for the material’s resistance to thermal-mechanical fatigue. Specimens with several different crystallographic orientations were plastically deformed in either tension or compression before and after the long term furnace exposure. While the thermally activated degradation of the microstructure causes a reduction in yield limit of up to 25% for specimens initially deformed in the |001 and |011| directions, none or only moderate reduction was seen for specimens initially deformed along the |111| direction. This can be explained by the strong correlation between yield limit reduction and the amount of γ coarsening. By introducing an isotropic degradation function in a newly developed crystal plasticity model, the constitutive behaviour of both virgin and degraded materials has been described with good agreement with the experimental results.

Place, publisher, year, edition, pages
Elsevier, 2010
Keyword
Deformation mechanisms, Rafting/Coarsening, Tension/compression asymmetry, Single-crystal superalloy
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-56590 (URN)10.1016/j.actamat.2010.05.032 (DOI)000280570500008 ()
Available from: 2010-05-25 Created: 2010-05-25 Last updated: 2016-05-18
3. Fatigue crack initiation in a notched single-crystal superalloy component
Open this publication in new window or tab >>Fatigue crack initiation in a notched single-crystal superalloy component
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2010 (English)In: Procedia Engineering, ISSN 1877-7058, Vol. 2, no 1, 1067-1075 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, the fatigue crack initiation in notched single-crystal test specimens of material MD2 is investigated and analysed. A critical plane approach is adopted, in which the total strain ranges on the discrete slip planes are evaluated. Furthermore, a Coffin-Manson type of expression is used to describe the number of cycles to fatigue crack initiation. This relation is determined from a set of smooth test specimens loaded uniaxially in the [001], [011] and directions at 500 °C with Rε=−1. The numerical procedure is then applied to a series of experiments, in which notched single-crystal test specimens were exposed to uniaxial cyclic loading in the [001] direction at 500 °C with Rε=0.

Place, publisher, year, edition, pages
Elsevier, 2010
Keyword
Fatigue initiation; Low cycle fatigue; Critical plane approach; Single-crystal superalloy
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-56588 (URN)10.1016/j.proeng.2010.03.115 (DOI)
Available from: 2010-05-25 Created: 2010-05-25 Last updated: 2014-09-25Bibliographically approved

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