liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Tension/Compression asymmetry of a single-crystal superalloy in virgin and degraded condition
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.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
Show others and affiliations
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. Vol. 58, no 15, 4986-4997 p.
Keyword [en]
Deformation mechanisms, Rafting/Coarsening, Tension/compression asymmetry, Single-crystal superalloy
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-56590DOI: 10.1016/j.actamat.2010.05.032ISI: 000280570500008OAI: oai:DiVA.org:liu-56590DiVA: diva2:320532
Available from: 2010-05-25 Created: 2010-05-25 Last updated: 2017-12-12
In thesis
1. Modelling of constitutive and fatigue behaviour of a single-crystal nickel-base superalloy
Open this publication in new window or tab >>Modelling of constitutive and fatigue behaviour of a single-crystal nickel-base superalloy
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
Single-crystal nickel-base superalloys, crystal plasticity, tension/compression asymmetry, rafting, fatigue initiation, critical plane approach
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-56288 (URN)LIU{TEK{LIC{2010:7 (Local ID)978-91-7393-384-1 (ISBN)LIU{TEK{LIC{2010:7 (Archive number)LIU{TEK{LIC{2010:7 (OAI)
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
2. 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

Open Access in DiVA

No full text

Other links

Publisher's full text

Authority records BETA

Leidermark, DanielMoverare, JohanJohansson, StenSimonsson, KjellSjöström, Sören

Search in DiVA

By author/editor
Leidermark, DanielMoverare, JohanJohansson, StenSimonsson, KjellSjöström, Sören
By organisation
Solid MechanicsThe Institute of TechnologyEngineering Materials
In the same journal
Acta Materialia
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 735 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf