Peer-Reviewed Journal Details
Mandatory Fields
Barrett, RA;O'Donoghue, PE;Leen, SB
2017
July
International Journal Of Fatigue
A physically-based constitutive model for high temperature microstructural degradation under cyclic deformation
Published
WOS: 20 ()
Optional Fields
THERMAL-MECHANICAL FATIGUE DISLOCATION-BASED MODEL STRAIN-RATE SENSITIVITY ANGLE GRAIN-BOUNDARIES MODIFIED 9CR-1MO STEEL MARTENSITIC STEEL THERMOMECHANICAL FATIGUE P91 STEEL LIFE PREDICTION 9CR-ODS STEEL
100
388
406
This paper presents a dislocation-mechanics cyclic viscoplasticity model which incorporates the key physical micro-mechanisms of strengthening and softening for high temperature deformation of 9Cr steels. In particular, these include precipitate and grain boundary strengthening, low-angle boundary dislocation annihilation and martensitic lath width evolution, using dislocation density as a key variable. The new model is applied to P91 steel across a range of strain-rates and strain-ranges in the 400-600 C temperature range, for power plant header applications, to demonstrate the effect of key microstructural parameters on high temperature low cycle fatigue performance. (C) 2017 Elsevier Ltd. All rights reserved.
0142-1123
10.1016/j.ijfatigue.2017.03.018
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