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Hold-time effect on the thermo-mechanical fatigue crack growth behaviour of Inconel 718
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.
2011 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 528, no 29-30, 8660-8670 p.Article in journal (Refereed) Published
Abstract [en]

In-phase TMF crack growth testing with different lengths of the hold time at the maximum temperature of 550 °C has been conducted on Inconel 718 specimens. Focus has been on establishing a method for TMF crack growth testing and investigating the effect of high temperature hold times on the TMF crack growth of the material. The tests are compared to isothermal crack propagation tests and show good correlation. It is concluded that the controlling effect of the crack growth is an embrittlement of the material. This embrittlement is related to the concept of a damaged zone active in front of the crack tip. The size of this damaged zone will control the crack propagation rate and therefore it does not matter if the load is cycled under isothermal or TMF conditions.

Place, publisher, year, edition, pages
Elsevier, 2011. Vol. 528, no 29-30, 8660-8670 p.
Keyword [en]
TMF, crack growth
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-71304DOI: 10.1016/j.msea.2011.08.027ISI: 000296676800046OAI: oai:DiVA.org:liu-71304DiVA: diva2:447181
Note
Funding agencies|Swedish Energy Agency||Siemens Industrial Turbomachinery AB||Volvo Aero Corporation||Royal Institute of Technology||Available from: 2011-10-11 Created: 2011-10-11 Last updated: 2017-12-08
In thesis
1. Constitutive and fatigue crack propagation behaviour of Inconel 718
Open this publication in new window or tab >>Constitutive and fatigue crack propagation behaviour of Inconel 718
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this licentiate thesis the work done in the TURBO POWER project Influence of high temperature hold times on the fatigue life of nickel-based superalloys will be presented. The overall objective of this project is to develop and evaluate tools for designing against fatigue in gas turbine applications, with special focus on the nickel-based superalloy Inconel 718. Firstly, the constitutive behaviour of the material has been been studied, where focus has been placed on trying to describe the mean stress relaxation and initial softening of the material under intermediate temperatures. Secondly, the fatigue crack propagation behaviour under high temperature hold times has been studied. Focus has here been placed on investigating the main fatigue crack propagation phenomena with the aim of setting up a basis for fatigue crack propagation modelling.

This thesis is divided into two parts. The first part describes the general framework, including basic constitutive and fatigue crack propagation behaviour as well as a theoretical background for the constitutive modelling of mean stress relaxation. This framework is then used in the second part, which consists of the four included papers.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, Electronisk Press, 2010. 38 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1461
Keyword
Nickel-base superalloys constitutive modelling mean stress relaxation fatigue crack propagation hold times grain boundary embrittlement
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-72610 (URN)LiU-TEK-LIC-2011:1 (Local ID)978-91-7393-258-5 (ISBN)LiU-TEK-LIC-2011:1 (Archive number)LiU-TEK-LIC-2011:1 (OAI)
Presentation
2011-02-04, ACAS, Hus A, ingång 17, Campus Valla, Linköpings universitet, Linköping, 10:15 (Swedish)
Opponent
Supervisors
Available from: 2011-12-05 Created: 2011-11-30 Last updated: 2011-12-12Bibliographically approved
2. High temperature fatigue crack propagation behaviour of Inconel 718
Open this publication in new window or tab >>High temperature fatigue crack propagation behaviour of Inconel 718
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The overall objective of this work has been to develop and evaluate tools for designing against fatigue in gas turbine applications, with special focus on the nickel-based superalloy Inconel 718. The fatigue crack propagation behaviour under high temperature hold times has been studied. Firstly, the main fatigue crack propagation phenomena have been investigated with the aim of setting up a basis for fatigue crack propagation modelling. Secondly, modelling of the observed behaviour has been performed. Finally, the constitutive behaviour of the material has been studied, where focus has been placed on trying to describe the mean stress relaxation and initial softening of the material under intermediate temperatures.

This thesis is divided into two parts. The first part describes the general framework, including basic observed fatigue crack propagation behaviour of the material when subjected to hold times at high temperature as well as a background for the constitutive modelling of mean stress relaxation. This framework is then used in the second part, which consists of the seven included papers.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 37 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1487
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-85934 (URN)978-91-7519-750-0 (ISBN)
Public defence
2013-02-01, C3, Hus C, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2012-12-03 Created: 2012-12-03 Last updated: 2012-12-10Bibliographically approved

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Moverare, JohanGustafsson, David

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