A precipitate evolution-based continuum damage mechanics model of creep behaviour in welded 9Cr steel at high temperature
Ó Murchú, Cathal Leen, Sean B. O’Donoghue, Padraic E. Barrett, Richard A.
Ó Murchú, Cathal
Leen, Sean B.
O’Donoghue, Padraic E.
Barrett, Richard A.
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Publication Date
2018-04-04
Type
journal article
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Citation
Ó Murchú, C., Leen, S., O’Donoghue, P., & Barrett, R. (2019). A precipitate evolution-based continuum damage mechanics model of creep behaviour in welded 9Cr steel at high temperature. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, 233(1), 39–51. https://doi.org/10.1177/1464420718762607
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.
Publisher
SAGE Publications
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CC BY-NC-ND