Peer-Reviewed Journal Details
Mandatory Fields
Murchu, CO;Leen, SB;O'Donoghue, PE;Barrett, RA
2019
January
Proceedings Of The Institution Of Mechanical Engineers Part L-Journal Of Materials-Design And Applications
A precipitate evolution-based continuum damage mechanics model of creep behaviour in welded 9Cr steel at high temperature
Published
WOS: 1 ()
Optional Fields
LONG-TERM CREEP P91 STEEL MICROSTRUCTURAL ZONES WELDMENT FAILURE JOINT
233
39
51
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.
1464-4207
10.1177/1464420718762607
Grant Details
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