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High-Temperature Fatigue Behaviour of Austenitic Stainless Steel: Influence of Ageing on Thermomechanical Fatigue and Creep-Fatigue Interaction
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The global energy consumption is increasing and together with global warming from greenhouse gas emission, create the need for more environmental friendly energy production processes. Higher efficiency of biomass power plants can be achieved by increasing temperature and pressure in the boiler section and this would increase the generation of electricity along with the reduction in emission of greenhouse gases e.g. CO2. The power generation must also be flexible to be able to follow the demands of the energy market, this results in a need for cyclic operating conditions with alternating output and multiple start-ups and shut-downs.

Because of the demands of flexibility, higher temperature and higher pressure in the boiler section of future biomass power plants, the demands on improved mechanical properties of the materials of these components are also increased. Properties like creep strength, thermomechanical fatigue resistance and high temperature corrosion resistance are critical for materials used in the next generation biomass power plants. Austenitic stainless steels are known to possess such good high temperature properties and are relatively cheap compared to the nickel-base alloys, which are already operating at high temperature cyclic conditions in other applications. The behaviour of austenitic stainless steels during these widened operating conditions are not yet fully understood.

The aim of this licentiate thesis is to increase the knowledge of the mechanical behaviour at high temperature cyclic conditions for austenitic stainless steels. This is done by the use of thermomechanical fatigue- and creepfatigue testing at elevated temperatures. For safety reasons, the effect of prolonged service degradation is investigated by pre-ageing before mechanical testing. Microscopy is used to investigate the microstructural development and resulting damage behaviour of the austenitic stainless steels after testing. The results show that creep-fatigue interaction damage, creep damage and oxidation assisted cracking are present at high temperature cyclic conditions. In addition, simulated service degradation resulted in a detrimental embrittling effect due to the deterioration by the microstructural evolution.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2018. , p. 32
Series
Linköping Studies in Science and Technology. Licentiate Thesis, ISSN 0280-7971 ; 1824
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-153100DOI: 10.3384/lic.diva-153100ISBN: 9789176851746 (print)OAI: oai:DiVA.org:liu-153100DiVA, id: diva2:1266204
Presentation
2018-12-14, ACAS, A-huset, Campus Valla, Linköping, 10:15 (English)
Opponent
Supervisors
Funder
Swedish Energy Agency, KME-701Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2018-12-06Bibliographically approved
List of papers
1. Creep-Fatigue Interaction in Heat Resistant Austenitic Alloys
Open this publication in new window or tab >>Creep-Fatigue Interaction in Heat Resistant Austenitic Alloys
2018 (English)In: MATEC Web of Conferences 165 , 05001 (2018) / [ed] EDP Sciences, EDP Sciences, 2018, Vol. 165Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
EDP Sciences, 2018
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-148182 (URN)10.1051/matecconf/2018165505001 (DOI)
Conference
Fatigue 2018 , 12th International Fatigue Congress, 27 May-1 June 2018, Poitiers, France
Available from: 2018-06-01 Created: 2018-06-01 Last updated: 2018-11-27

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Wärner, Hugo

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4344454647484946 of 88
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