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.
| Original language | English (Ireland) |
|---|---|
| Number of pages | 12 |
| Journal | Proceedings Of The Institution Of Mechanical Engineers Part L-Journal Of Materials-Design And Applications |
| Volume | 233 |
| DOIs | |
| Publication status | Published - 1 Jan 2019 |
Authors (Note for portal: view the doc link for the full list of authors)
- Authors
- Murchu, CO;Leen, SB;O'Donoghue, PE;Barrett, RA
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