Microtomographic investigation of damage in E911 steel after long term creep

Damage distribution in a notched hollow cylinder made of E911 steel and crept for 26,000 h at 575 °C under multi-axial stress state is assessed. Based on high-resolution tomographic reconstructions the size, shape and spatial distribution of voids along the notch radius have been characterized. The...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2010-11, Vol.528 (1), p.103-111
Main Authors: Sket, F., Dzieciol, K., Borbély, A., Kaysser-Pyzalla, A.R., Maile, K., Scheck, R.
Format: Article
Language:English
Subjects:
Cylinders
Damage
Density
Engineering Sciences
High temperature creep
Materials
Microtomography
Reconstruction
Spatial distribution
Stresses
Structural steels
Voids
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Summary:Damage distribution in a notched hollow cylinder made of E911 steel and crept for 26,000 h at 575 °C under multi-axial stress state is assessed. Based on high-resolution tomographic reconstructions the size, shape and spatial distribution of voids along the notch radius have been characterized. The spatial distribution of void density shows strong correlation with stress triaxiality, maximum principal stress and the equivalent von Mises stress. The analysis of the size distribution of non-coalesced voids in terms of general power-law functions describing nucleation and growth indicates that void growth in E911 steel is dominated by the constrained diffusion mechanism.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2010.07.029