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Fatigue Crack Growth behaviour of Inconel 718 - the Concept of a Damaged Zone Caused by High Temperature Hold Times
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, The Institute of Technology. Linköping University, Department of Management and Engineering, Solid Mechanics.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, The Institute of Technology.
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2011 (English)In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 10, 2821-2826 p.Article in journal (Refereed) Published
Abstract [en]

Fatigue crack growth testing of Inconel 718 has been carried out at the temperatures 550 °C and 650 °C. The tests were conducted using a mix of hold times and pure cyclic loading, referred to as block tests. From the test results, the existence of an embrittled volume or damaged zone in the vicinity of the crack tip has been revealed. It has been found that the evolution of this damaged zone can be sufficiently well described using a power law function with an exponent n = 0.25.

Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 10, 2821-2826 p.
Keyword [en]
nickel base superalloys, fatigue crack propagation, Inconel 718, hold times, grain boundary embrittlement
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-70552DOI: 10.1016/j.proeng.2011.04.469OAI: oai:DiVA.org:liu-70552DiVA: diva2:440286
Available from: 2011-09-12 Created: 2011-09-12 Last updated: 2017-12-08
In thesis
1. 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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Gustafsson, DavidMoverare, JohanSimonsson, KjellJohansson, StenSjöström, Sören

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