Autonomous filling of creep cavities in Fe-Au alloys studied by synchrotron X-ray nano-tomography

被引：36
|
作者：
Fang, H. [1 ,2 ]
Versteylen, C. D. [1 ]
Zhang, S. [1 ]
Yang, Y. [3 ]
Cloetens, P. [3 ]
Ngan-Tillard, D. [4 ]
Bruck, E. [1 ]
van der Zwaag, S. [2 ]
van Dijk, N. H. [1 ]
机构：
[1] Delft Univ Technol, Fac Sci Appl, Fundamental Aspects Mat & Energy Grp, Mekelweg 15, NL-2629 JB Delft, Netherlands
[2] Delft Univ Technol, Novel Aerosp Mat Grp, Fac Aerosp Engn, Kluyverweg 1, NL-2629 HS Delft, Netherlands
[3] European Synchrotron Radiat Facil, F-38043 Grenoble 9, France
[4] Fac Civil Engn & Geosci, Dept Geosci & Engn, Stevinweg 1, NL-2628 CN Delft, Netherlands
来源：
ACTA MATERIALIA | 2016年 / 121卷
关键词：
Self healing; Creep; Fe alloys; Synchrotron radiation; X-ray tomography; AUSTENITIC STAINLESS-STEEL; B-N ALLOYS; HIGH-TEMPERATURE STRENGTH; GRAIN-BOUNDARY; 3-DIMENSIONAL CHARACTERIZATION; INTERGRANULAR FRACTURE; DIFFUSIVE CAVITATION; MARTENSITIC STEEL; GROWTH; DAMAGE;
D O I：
10.1016/j.actamat.2016.09.023
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The autonomous filling of creep-loading induced grain-boundary cavities by gold-rich precipitates at a temperature of 550 degrees C has been studied as a function of the applied load for Fe-Au alloys using synchrotron X-ray nano-tomography. The alloy serves as a model alloy for future self-healing creep resistant steels. The size, shape and spatial distribution of cavities and precipitates are analyzed quantitatively in 3D at a nanometer resolution scale. The filling ratios for individual cavities are determined and thus a map of the filling ratio evolution is obtained. It is found that the gold-rich precipitates only form at cavity surfaces and thereby repair the creep cavity. The shape of the cavities changes from equiaxed to planar crack like morphologies as the cavities grow. The time evolution of the filling ratio is explained by a simple model considering isolated cavities as well as linked cavities. The model predictions are in good agreement with the measurements. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：352 / 364
页数：13
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