Constitutive and fatigue crack propagation behaviour of Inconel 718
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
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.
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1461
Nickel-base superalloys constitutive modelling mean stress relaxation fatigue crack propagation hold times grain boundary embrittlement
IdentifiersURN: urn:nbn:se:liu:diva-72610Local ID: LiU-TEK-LIC-2011:1ISBN: 978-91-7393-258-5OAI: oai:DiVA.org:liu-72610DiVA: diva2:460428
2011-02-04, ACAS, Hus A, ingång 17, Campus Valla, Linköpings universitet, Linköping, 10:15 (Swedish)
Persson, Christer, Professor
Simonsson, Kjell, ProfessorMoverare, Johan, Dr.Sören, Sjöström, ProfessorJohansson, Sten, Professor
List of papers