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A precipitate evolution-based continuum damage mechanics model of creep behaviour in welded 9Cr steel at high temperature.
- Source :
- Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design & Applications (Sage Publications, Ltd.); Jan2019, Vol. 233 Issue 1, p39-51, 13p
- Publication Year :
- 2019
-
Abstract
- A multiaxial, physically based, continuum damage mechanics methodology for creep of welded 9Cr steels is presented, incorporating a multiple precipitate-type state variable, which simulates the effects of strain- and temperature-induced coarsening kinematics. Precipitate volume fraction and initial diameter for carbide and carbo-nitride precipitate types are key microstructural variables controlling time to failure in the model. The heat-affected zone material is simulated explicitly utilising measured microstructural data, allowing detailed investigation of failure mechanisms. Failure is shown to be controlled by a combination of microstructural degradation and Kachanov-type damage for the formation and growth of creep cavities. Comparisons with experimental data demonstrate the accuracy of this model for P91 material. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14644207
- Volume :
- 233
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design & Applications (Sage Publications, Ltd.)
- Publication Type :
- Academic Journal
- Accession number :
- 133798424
- Full Text :
- https://doi.org/10.1177/1464420718762607