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Thermomechanical Fatigue Behaviour of Aged Heat Resistant Austenitic Alloys
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering. Sandvik Materials Technology, Sandviken, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, no 127, p. 509-521Article in journal (Refereed) Published
Abstract [en]

The increasing demands for efficiency and flexibility result in more severe operating conditions for the materials used in critical components of biomass power plants. These operating conditions involve higher temperature ranges, more pronounced environmental effects and cyclic operations. Austenitic stainless steels have shown to possess promising high temperature properties which makes them suitable as candidates for critical components in biomass power plant. However, their behaviour under such conditions is not yet fully understood. This work investigates three commercial austenitic alloys: Esshete 1250, Sanicro 25 and Sanicro 31HT. The alloys were subjected to in-phase (IP) thermomechanical fatigue (TMF) testing under strain-control in the temperature range of 100–800 °C. Both virgin and pre-aged TMF specimens were tested in order to simulate service degradation resulting from long-term usage. The results show that the pre-aged specimens suffered shorter TMF-life compared to the virgin specimens. The scanning electron microscopy methods electron backscatter diffraction (EBSD) and energy dispersive spectroscopy (EDS) were used to analyse and discuss active failure and deformation mechanisms. The difference in TMF-life produced by the two testing conditions was attributed to an embrittling effect by precipitation, reduced creep properties and oxidation assisted cracking.

Place, publisher, year, edition, pages
Elsevier, 2019. no 127, p. 509-521
Keywords [en]
Thermomechanical fatigue, austenitic alloys, pre-ageing
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-159644DOI: 10.1016/j.ijfatigue.2019.06.012ISI: 000482492600046Scopus ID: 2-s2.0-85068255817OAI: oai:DiVA.org:liu-159644DiVA, id: diva2:1342815
Note

Funding agencies: AB Sandvik Materials Technology in Sweden; Swedish Energy Agency through the Research Consortium of Materials Technology for Thermal Energy Processes [KME-701]

Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-10-16Bibliographically approved

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The full text will be freely available from 2021-06-18 08:00
Available from 2021-06-18 08:00

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Wärner, HugoCalmunger, MattiasChai, GuocaiJohansson, StenMoverare, Johan

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