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  Self healing of creep damage in iron-based alloys by supersaturated tungsten

Fang, H., Szymański, N. K., Versteylen, C. D., Cloetens, P., Kwakernaak, C., Sloof, W., et al. (2019). Self healing of creep damage in iron-based alloys by supersaturated tungsten. Acta Materialia, 166, 531-542. doi:10.1016/j.actamat.2019.01.014.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-ACBB-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-ACBC-8
Genre: Journal Article

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 Creators:
Fang, H.1, 2, Author              
Szymański, N. K.3, Author              
Versteylen, Casper D.3, Author              
Cloetens, Peter4, Author              
Kwakernaak, Cornelis5, Author              
Sloof, Wim6, Author              
Tichelaar, Frans D.7, Author              
Balachandran, Shanoob8, Author              
Herbig, Michael8, Author              
Brück, Ekkes9, Author              
van der Zwaag, Sybrand10, 11, Author              
van Dijk, Niels9, Author              
Affiliations:
1Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, Delft, The Netherlands, ou_persistent22              
2Novel Aerospace Materials Group, Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1, Delft, The Netherlands, ou_persistent22              
3Fundamental Aspects of Materials and Energy Group, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB, Delft, The Netherlands, ou_persistent22              
4European Synchrotron Radiation Facility, 38043, Grenoble Cedex 9, France, ou_persistent22              
5Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands, ou_persistent22              
6Department of Materials Science and Engineering, Delft University of Technology, The Netherlands, ou_persistent22              
7Kavli Institute of Nanoscience, National Centre for HREM, Delft University of Technology, Lorentzweg 1, Delft, The Netherlands, ou_persistent22              
8Materials Science of Mechanical Contacts, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2324693              
9Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, The Netherlands, ou_persistent22              
10Novel Aerospace Materials group, Faculty of Aerospace Engineering, Delft University of Technology, The Netherlands, ou_persistent22              
11School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China, ou_persistent22              

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Free keywords: Binary alloys; Grain boundaries; Iron alloys; Precipitation (chemical); Self-healing materials; Steel; Synchrotron radiation; Synchrotrons; Tomography; Tungsten alloys, Creep cavitation; Creep damages; Degree of filling; Elevated temperature; High temperature creep; Selective precipitation; Self-healing; Synchrotron x rays, Creep
 Abstract: When metals are mechanically loaded at elevated temperatures for extended periods of time, creep damage will occur in the form of cavities at grain boundaries. In the present experiments it is demonstrated that in binary iron-tungsten alloys creep damage can be self healed by selective precipitation of a W-rich phase inside these cavities. Using synchrotron X-ray nano-tomography the simultaneous evolution of creep cavitation and precipitation is visualized in 3D images with a resolution down to 30 nm. The degree of filling by precipitation is analysed for a large collection of individual creep cavities. Two clearly different types of behaviour are observed for isolated and linked cavities, where the isolated cavities can be filled completely, while the linked cavities continue to grow. The demonstrated self-healing potential of tungsten in iron-based metal alloys provides a new perspective on the role of W in high-temperature creep-resistant steels. © 2019 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2019-01-112019-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.actamat.2019.01.014
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 166 Sequence Number: - Start / End Page: 531 - 542 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100