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High Temperature Fatigue of Aged Heavy Section Austenitic Stainless Steels
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. AB Sandvik Materials Technology R and D Center, Sandviken, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8304-0221
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-8306-3987
2022 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 15, no 1, article id 84Article in journal (Refereed) Published
Abstract [en]

This work investigates two austenitic stainless steels, Sanicro 25 which is a candidate for high temperature heavy section components of future power plants and Esshete 1250 which is used as a reference material. The alloys were subjected to out-of-phase (OP) thermomechanical fatigue (TMF) testing under strain-control in the temperature range of 100 ∘C to 650 ∘C. Both unaged and aged (650 ∘C, 3000 h) TMF specimens were tested to simulate service degradation resulting from long-term usage. 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 Sanicro 25 results show that the aged specimens suffered increased plastic straining and shorter TMF-life compared to the unaged specimens. The difference in TMF-life of the two test conditions was attributed to an accelerated microstructural evolution that provided decreased the effectiveness for impeding dislocation motion. Ageing did not affect the OP-TMF life of the reference material, Esshete 1250. However, the structural stability and its resistance for cyclic deformation was greatly reduced due to coarsening and cracking of the strengthening niobium carbide precipitates. Sanicro 25 showed the higher structural stability during OP-TMF testing compare with the reference material.

Place, publisher, year, edition, pages
Basel, Switzerland: MDPI, 2022. Vol. 15, no 1, article id 84
Keywords [en]
high temperature austenitic stainless steels, out-of-phase thermomechanical fatigue, crack propagation analysis, electron backscatter diffraction (EBSD), energy-dispersive X-ray spectroscopy (EDS)
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-182258DOI: 10.3390/ma15010084ISI: 000751248900001PubMedID: 35009228Scopus ID: 2-s2.0-85121749412OAI: oai:DiVA.org:liu-182258DiVA, id: diva2:1626364
Note

Funding: AB Sandvik Materials Technology in Sweden; Swedish Energy Agency through the Research Consortium of Materials Technology for Thermal Energy Processes [KME-801]

Available from: 2022-01-11 Created: 2022-01-11 Last updated: 2022-02-18Bibliographically approved

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Wärner, HugoChai, GuocaiMoverare, JohanCalmunger, Mattias

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