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

Fang, H.; Szymanski, N.; van der Zwaag, S.; van Dijk, N.H.; Versteylen, C.D.; Cloetens, P.; Kwakernaak, C.; Sloof, W.G.; Tichelaar, F.D.; Balachandran, S.; Herbig, M; Brück, E.H.

doi:10.1016/j.actamat.2019.01.014

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

Journal article (2019)

Authors

H. Fang RST/Fundamental Aspects of Materials and Energy - , Novel Aerospace Materials - Aerospace Engineering

N. Szymanski Student

S. van der Zwaag Tsinghua University, Novel Aerospace Materials - Aerospace Engineering

N.H. van Dijk RST/Fundamental Aspects of Materials and Energy -

C.D. Versteylen RST/Fundamental Aspects of Materials and Energy -

P. Cloetens European Synchrotron Radiation Facility

C. Kwakernaak (OLD) MSE-1

W.G. Sloof (OLD) MSE-1

F.D. Tichelaar Kavli institute of nanoscience Delft, QN/Afdelingsbureau

S. Balachandran Max-Planck-Institut für Eisenforschung

M Herbig Max-Planck-Institut für Eisenforschung

E.H. Brück RST/Fundamental Aspects of Materials and Energy -

Research Group

Novel Aerospace Materials (Aerospace Engineering) (TU Delft)

DOI: https://doi.org/10.1016/j.actamat.2019.01.014

Tomography Synchrotron radiation Self-healing Steel Creep damage

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Published Date

2019

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

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.

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