%0 Journal Article
%T A precipitate evolution
%A C ¨® Murch¨²
%A PE O¡¯Donoghue
%A RA Barrett
%A SB Leen
%J Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications
%@ 2041-3076
%D 2019
%R 10.1177/1464420718762607
%X 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
%K Precipitates
%K weldments
%K 9Cr steels
%K damage mechanics
%K lifetime prediction
%U https://journals.sagepub.com/doi/full/10.1177/1464420718762607