Modified 9Cr-1Mo steel (T91) is a candidate material for pressure vessels and for some internal structures of GCR (Gas Cooled Reactors). In order to validate this choice, it is necessary, to check if it is covered by the existing design codes, concerning its procurement, fabrication, welding, examination methods and mechanical design rules. A large R&D program on mod 9Cr-1Mo steel has been undertaken at CEA in order to characterize the behavior of this material and of its welded junctions. In this program, the role of the Laboratory for structural Integrity and Standards (LISN) is to develop high temperature defect assessment procedures under fatigue, creep and creep-fatigue loadings, to validate the existing methods (developed on austenitic stainless steels as 316L(N) for the fast reactors) and to get new experimental data on Mod 9Cr-1Mo steel. This paper presents the experimental program undertaken to develop defect assessment under creep loading and describes the main results obtained. Then a creep propagation law is proposed for the Mod 9Cr-1Mo steel at 550°C. To validate the experimental interpretation, a numerical analysis with a 3D finite element model is proposed and allows to model the propagation of the crack. Finally, a comparison of the experimental and the numerical data and in particular of the C* value is investigated.
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ASME 2007 Pressure Vessels and Piping Conference
July 22–26, 2007
San Antonio, Texas, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4287-8
PROCEEDINGS PAPER
Determination and Modeling of the Creep Propagation on High Chromium Steel
Olivier Ancelet,
Olivier Ancelet
CEA Saclay, Gif sur Yvette Cedex, France
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Ste´phane Chapuliot
Ste´phane Chapuliot
CEA Saclay, Gif sur Yvette Cedex, France
Search for other works by this author on:
Olivier Ancelet
CEA Saclay, Gif sur Yvette Cedex, France
Ste´phane Chapuliot
CEA Saclay, Gif sur Yvette Cedex, France
Paper No:
CREEP2007-26192, pp. 99-107; 9 pages
Published Online:
August 20, 2009
Citation
Ancelet, O, & Chapuliot, S. "Determination and Modeling of the Creep Propagation on High Chromium Steel." Proceedings of the ASME 2007 Pressure Vessels and Piping Conference. Volume 9: Eighth International Conference on Creep and Fatigue at Elevated Temperatures. San Antonio, Texas, USA. July 22–26, 2007. pp. 99-107. ASME. https://doi.org/10.1115/CREEP2007-26192
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