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

被引：24

作者：

Fang, H. ^{[1
,2
]}

Szymanski, N. ^{[1
]}

Versteylen, C. D. ^{[1
]}

Cloetens, P. ^{[3
]}

Kwakernaak, C. ^{[4
]}

Sloof, W. G. ^{[4
]}

Tichelaar, F. D. ^{[5
]}

Balachandran, S. ^{[6
]}

Herbig, M. ^{[6
]}

Bruck, E. ^{[1
]}

van der Zwaag, S. ^{[2
,7
]}

van Dijk, N. H. ^{[1
]}

机构：

[1] Delft Univ Technol, Fac Appl Sci, Fundamental Aspects Mat & Energy Grp, Mekelweg 15, NL-2629 JB Delft, Netherlands

[2] Delft Univ Technol, Fac Aerosp Engn, Novel Aerosp Mat Grp, Kluyverweg 1, NL-2629 HS Delft, Netherlands

[3] European Synchrotron Radiat Facil, F-38043 Grenoble 9, France

[4] Delft Univ Technol, Dept Mat Sci & Engn, Mekelweg 2, NL-2628 CD Delft, Netherlands

[5] Delft Univ Technol, Natl Ctr HREM, Kavli Inst Nanosci, Lorentzweg 1, NL-2628 CJ Delft, Netherlands

[6] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[7] Tsinghua Univ, Sch Mat Sci & Engn, Beijing 100084, Peoples R China

来源：

ACTA MATERIALIA | 2019年 / 166卷

关键词：

Self-healing; Creep damage; Synchrotron radiation; Tomography; Steel; FE-AU; STEEL; PRECIPITATION; CAVITATION; STRENGTH; DESIGN; TOMOGRAPHY; EVOLUTION; DUCTILITY; CAVITIES;

D O I：

10.1016/j.actamat.2019.01.014

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：531 / 542

页数：12

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